Feed status · checked 2026-10-07
Altamont Corridor Express
Based on a Mobility Database mirror copy of an archived feed listing
Service mode Rail
unchanged since 2026-10-06
Cataloged in California.
A data-quality and completeness lens to help an agency improve its GTFS feed. Not an official compliance determination from any transit program. New to this? How to read your scorecard. Interactive view of this scorecard. Rubric v1.4, validator 8.0.1.
Checked for changes 39 minutes ago; last fetch returned HTTP 403.
Measured 3 of 4 score categories from the Mobility Database's mirror copy of the feed.
How we measured this
Confidence in this measurement: provisional.
- Realtime quality was not measured this run. It does not count against the grade.
- The archived feed URL on file was unreachable, so the Mobility Database's hosted mirror copy was scored instead.
Confidence describes how much the pipeline could measure this run, not the feed itself. It never changes the grade.
About this feed
Altamont Corridor Express’s published feed lists 1 rail route, 8 scheduled trips and 28 stops. Its service dates run from 2019-09-30 through 2024-12-31. The published file has not changed since our first check on 2026-06-19.
Top things to fix
Re-export the feed with a calendar that reaches further out. Set feed_end_date in feed_info.txt past your next service change.Likely your export tool
Service data ended 645 day(s) ago. When the calendar runs out, trip planners stop showing this agency even though the transit vehicles are still running. Riders are told the service does not exist.
This one is about the feed as a whole, so there is no share of it to count.
⏱ Usually one export setting; export on a schedule so it never lapses again.worth about +100 points in its category
Add the required column named in the finding to the flagged file.Likely your export tool
A file is missing a column that GTFS requires. Apps may reject the whole file, so riders could lose the affected routes or stops.
This is a validator notice, and the validator decides what each instance covers, so no share of the network can be read from it here.
⏱ Often an export setting; ask your vendor if it recurs.worth about +12 points in its category
Review the rule documentation for 'equal_shape_distance_diff_coordinates' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed.
Equal shape distance diff coordinates (flagged by the MobilityData validator). See the linked rule for what this affects.
This is a validator notice, and the validator decides what each instance covers, so no share of the network can be read from it here.
⏱ Varies.worth about +12 points in its category
Riders and need behind these fixes
- No ridership snapshot was on hand when this was built, so annual rider-trips are not known.
- California as a whole measures lower on transit need. That is a statewide reading, not one for this feed's service area. Source: US Census ACS 5-year 2022, statewide overlay, as of 2026-10-05.
These describe this feed only. They do not rank agencies, and they do not change the grade or the order of the fixes.
This feed URL points at the TransitFeeds archive, which is no longer maintained. Before any single fix, publish the feed from a live URL you control and update the listings that still point here.
Finding handoff
Move one finding to a recheck
Select one finding. Copy the request, make the change in the feed-producing tool, then compare the next complete run.
- Finding
- Fix 01 in Top things to fix: its feed evidence and the requested change.
- Recheck
- Publish the changed feed at the same URL. On the next complete, comparable scorecard run, confirm that this finding is no longer reported.
Copy handoff text
- Finding
- Fix 02 in Top things to fix: its feed evidence and the requested change.
- Recheck
- Publish the changed feed at the same URL. On the next complete, comparable scorecard run, confirm that this finding is no longer reported.
Copy handoff text
- Finding
- Fix 03 in Top things to fix: its feed evidence and the requested change.
- Recheck
- Publish the changed feed at the same URL. On the next complete, comparable scorecard run, confirm that this finding is no longer reported.
Copy handoff text
How to make and check these changes
Check the result on the published feed. Read the guide, make the change in your tool, and use the next comparable run to see whether the finding is still reported. Only an action or ticket record can attribute who made the change.
Fix 01 · Read the fix guide for scorecard_feed_expired
Make the change. This feed URL points at the TransitFeeds archive, which is no longer maintained. Before any single fix, publish the feed from a live URL you control and update the listings that still point here.
Check the result. The next scorecard run checks this finding again. If a comparable check no longer reports it, the feed's clearance log records that result. This confirms feed state, not who made the change. Self-check a feed before you publish.
Fix 02 · Read the fix guide for missing_required_column
Make the change. This feed URL points at the TransitFeeds archive, which is no longer maintained. Before any single fix, publish the feed from a live URL you control and update the listings that still point here.
Check the result. The next scorecard run checks this finding again. If a comparable check no longer reports it, the feed's clearance log records that result. This confirms feed state, not who made the change. Self-check a feed before you publish.
Make the change. This feed URL points at the TransitFeeds archive, which is no longer maintained. Before any single fix, publish the feed from a live URL you control and update the listings that still point here.
Check the result. The next scorecard run checks this finding again. If a comparable check no longer reports it, the feed's clearance log records that result. This confirms feed state, not who made the change. Self-check a feed before you publish.
Rider view: what this feed publishes
A quick read of rider-facing information in this feed.
- Schedule visibility
- The feed's last published service date was 645 days ago.
- Published accessibility data
- Accessibility information is stated for 100% of stops and 100% of trips. This measures published data, not whether stops or vehicles are physically usable.
- Fare information
- Fare information is published using GTFS Fares v1.
- Realtime information
- Realtime-feed availability and live-arrival coverage are not known from this scorecard.
Important: This does not rate service reliability. Riders should confirm current service alerts, fares, and accessibility accommodations with the transit operator before traveling.
Send your vendor a fix request
This feed is served from the TransitFeeds archive, which is no longer maintained. The most useful request is publishing the current feed from a live URL, then these fixes. Each fix names the validator notice and a guide link.
Send the agency a note
Supporting this agency? Copy this and email it to them. It names what lapsed, why it matters to riders, and the one setting to change.
Score by category
The MobilityData validator flagged 11 kinds of issue across 211 instances (3 error, 203 warning, 5 informational).
Service data ended 645 day(s) ago. Trip planners have likely already dropped this feed.
100% of stops state wheelchair accessibility (100% marked accessible, 0% marked not accessible). This measures what the feed publishes, not whether a stop is physically usable. Fare data is published.
100% of stops state accessibility (100% marked accessible). Reflects what the feed states, not verified physical usability.
Fares are applied to trips.
Not scored yet. Nothing here counts against the grade.
Routes and stops
Each route is drawn once, using the longest shape its trips follow; stops are the dots.
This feed has 28 stops.
The route and stop data is ready below. Load the map only when you want the geographic view. It uses additional data.
Basemap: OpenFreeMap, © OpenStreetMap contributors. Routes and stops: this agency's GTFS feed.
- ACETrain (purple)
| Route | Type | Line color |
|---|---|---|
| ACETrain ACE Train | Rail | purple |
List every stop
- Merced Amtrak Station
- Antioch Amtrak Station
- Bakersfield Amtrak Station
- Corcoran Amtrak Station
- Fresno Amtrak Station
- Fremont Amtrak Station
- Emeryville Amtrak Station
- Great America Parkway Amtrak Station
- Hanford Amtrak Station
- Los Angeles Amtrak Station
- Livermore Amtrak Station
- Lodi Amtrak Station
- Lathrop Amtrak Station
- Madera Amtrak Station
- Oakaland Amtrak Station
- Modesto Amtrak Station
- Martinez Amtrak Station
- Sacremento Amtrak Station
- Santa Clara Amtrak Station
- Richmond Amtrak Station
- San Jose Amtrak Station
- Stockton- San Joaquin Street Amtrak Station
- Pleasanton Amtrak Station
- Stockton- Robert J Cabral Amtrak Station
- Vasco Rt Amtrak Station
- Tracy Amtrak Station
- Turlock-Denair Amtrak Station
- Wasco Amtrak Station
Over time
Overall score across the last 2 checks — unchanged since 2026-10-06.
Show the numbers
| Check | Score | Change |
|---|---|---|
| 2026-10-06 | 46.8 | first check |
| 2026-10-07 | 46.8 | no change |
What changed since your last check
- Correctness no change
- Freshness no change
- Rider experience no change
Feed history
Every check on record for this feed, grouped by the published file, newest first. A new file means the published zip changed. Grades from earlier rubric versions are shown with their rubric and are not comparable with today’s grade or the trend above.
| Checked | Published file | Service dates through | Grade at the time |
|---|---|---|---|
| 2026-10-06 to 2026-10-07 (2 checks) | 915ef5cab6d3 | 2024-12-31 | Current rubric: see the trend above |
| 2026-08-06 to 2026-08-07 (2 checks) | 915ef5cab6d3 | 2024-12-31 | F, 46.8 under rubric 1.3, an earlier scoring contract; not comparable with today’s grade |
| 2026-06-19 to 2026-07-10 (21 checks) | 915ef5cab6d3 | 2024-12-31 | F, 46.8 under rubric 1.1, an earlier scoring contract; not comparable with today’s grade |
What changed in this feed
Overall grade and score held steady since 2026-10-06.
Same feed file as 2026-10-06; the published zip did not change.
Subscribe to this feed’s changes (Atom) to hear about grade drops and export changes in a reader, with no sign-up.
Everything we checked
13 findings, ordered by severity.
Show every finding
- Error2 instances
A file is missing a column that GTFS requires.
Apps may reject the whole file, so riders could lose the affected routes or stops.
Fix: Add the required column named in the finding to the flagged file. (Often an export setting; ask your vendor if it recurs.)
Finding code: missing_required_column · Read the fix guide for missing_required_column · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Error1 instance
Equal shape distance diff coordinates (flagged by the MobilityData validator).
See the linked rule for what this affects.
Fix: Review the rule documentation for 'equal_shape_distance_diff_coordinates' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed. (Varies.)
Finding code: equal_shape_distance_diff_coordinates · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Error1 instance
Service data ended 645 day(s) ago.
When the calendar runs out, trip planners stop showing this agency even though the transit vehicles are still running. Riders are told the service does not exist.
Fix: Re-export the feed with a calendar that reaches further out. Set feed_end_date in feed_info.txt past your next service change. (Usually one export setting; export on a schedule so it never lapses again.)
Finding code: scorecard_feed_expired · Read the fix guide for scorecard_feed_expired · See GTFS Best Practices (opens GTFS Best Practices on an external site)
- Warning180 instances
Some files leave out fields that GTFS asks for but does not require.
Recommended fields like agency_phone or stop descriptions make the feed more useful to riders and trip planners.
Fix: Review the flagged fields and fill in the ones your riders would use. (A field at a time; not urgent.)
Finding code: missing_recommended_field · Read the fix guide for missing_recommended_field · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Warning18 instances
Some stops exist in the feed but no trip ever stops at them.
Riders may walk to a stop where no transit vehicle is scheduled to arrive.
Fix: Remove retired stops from the export, or add them back to the trips that should serve them. (A review pass in your scheduling software.)
Finding code: stop_without_stop_time · Read the fix guide for stop_without_stop_time · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Warning1 instance
Some route lines list the same point twice in a row.
Repeated points don't hurt riders, but they can skew distance math and hint at a shaky export.
Fix: Turn on shape cleanup in your export tool, or drop the repeated points from shapes.txt. (Usually one export setting.)
Finding code: equal_shape_distance_same_coordinates · Read the fix guide for equal_shape_distance_same_coordinates · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Warning1 instance
Some service calendars in the feed have already ended.
Expired calendars are dead weight and can hide real schedule problems from your staff and vendors.
Fix: Remove past service periods the next time you export the feed. (One setting in most export tools.)
Finding code: expired_calendar · Read the fix guide for expired_calendar · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Warning1 instance
This feed's service calendar runs out within the next 7 days.
When the calendar ends, Google Maps and other trip planners drop your agency entirely. Riders see no service at all.
Fix: Export and publish an updated GTFS feed that covers at least the next 30 days of service. (Usually a re-export from your scheduling software.)
Finding code: feed_expiration_date7_days · Read the fix guide for feed_expiration_date7_days · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Warning1 instance
feed_info.txt lists no contact email and no contact URL.
Without a contact, apps like Google Maps can't reach you when they find a problem in the feed.
Fix: Add feed_contact_email or feed_contact_url to feed_info.txt. (One field, set once in export settings.)
Finding code: missing_feed_contact_email_and_url · Read the fix guide for missing_feed_contact_email_and_url · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Warning1 instance
Many of the feed's trips don't run at all in the next 7 days.
It usually means old service periods are still in the export, making the feed bigger and harder to check.
Fix: Trim past service periods the next time you export. (One setting in most export tools.)
Finding code: trip_coverage_not_active_for_next7_days · Read the fix guide for trip_coverage_not_active_for_next7_days · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Info4 instances
The feed includes a file that is not part of the GTFS spec.
Apps ignore files they don't know, and a stray file can hide a misspelled standard file name.
Fix: Check the flagged file name for a typo of a standard GTFS file. Remove it if it is a vendor extra. (A quick look at the flagged file.)
Finding code: unknown_file · Read the fix guide for unknown_file · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Info1 instance
Some files contain columns that are not part of the GTFS spec.
Harmless to riders, but apps ignore these columns and they can hide typos in real column names.
Fix: Check the flagged column names for misspellings of standard GTFS fields; remove them if they are vendor extras. (A quick look at the flagged files.)
Finding code: unknown_column · Read the fix guide for unknown_column · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
- Info1 instance
feed_info.txt has no technical contact (feed_contact_email or feed_contact_url).
App makers and state data programs have nobody to email when they spot a problem. Small errors then sit in the feed for months.
Fix: Add feed_contact_email to feed_info.txt. (One field.)
Finding code: scorecard_no_feed_contact · Read the fix guide for scorecard_no_feed_contact · See MobilityData GTFS Validator rules (opens the validator rules on an external site)
NTD GTFS readiness Not ready
Resolve this before you certify on the D-10. 2 validator errors to resolve. Service data expired 645 days ago, so FTA would find the link out of date.
- Published Ready
- Published at a public URL.
- Valid Needs attention
- 2 validator errors to resolve.
- Current Not ready
- Service data expired 645 days ago, so FTA would find the link out of date.
- agency_id provided Ready
- agency.txt provides agency_id. For RY2026, keep one stable value for each NTD reporter represented in the feed and crosswalk each value on the P-50 form.
- agency_id equals your NTD ID (optional) Different (allowed)
- Your feed's agency_id is CE; your National Transit Database ID is 90182. A feed that serves several agencies (a shared regional feed) can legitimately carry more than one agency_id. The values do not need to equal the five-digit NTD ID, so this difference is allowed and carries no score. Confirm that P-50 crosswalks agency_id CE to NTD ID 90182, and keep the feed value stable. Do not change it solely to make the two values equal.
- shapes.txt covers your trips Ready
- All 8 trips have a shape in shapes.txt.
In plain words: if you report to the federal transit database, you have to publish a working, up-to-date feed, provide a stable agency_id for each represented reporter, and confirm the feed and P-50 crosswalk each year. This box is a heads-up; your filings are the official check.
A readiness signal mapping this feed to the FTA National Transit Database GTFS requirement (Report Year 2023 onward: a public, valid, current feed, certified annually on the D-10). For RY2026, each represented reporter needs a stable agency_id, unique within the feed and crosswalked to its five-digit NTD ID on P-50; the values do not need to be equal. FTA also requires shapes.txt in the published GTFS: Full Reporters from Report Year 2025, and Reduced, Rural, and Tribal Reporters from Report Year 2026. Not an official determination; your certification is the official check.
Conformance mark Not yet
Two requirements remain for this feed to earn the conformance mark. 2 validator errors to resolve. Service data expired 645 days ago.
- Valid Not yet
- 2 validator errors to resolve.
- Current Not yet
- Service data expired 645 days ago.
- Accessible Met
- States wheelchair access on 100% of stops and 100% of trips.
In plain words: earn this mark when your feed passes validation, has not expired, and says whether nearly every stop and trip is wheelchair accessible.
A pass credential for a feed that is valid, current, and states wheelchair access on nearly every stop and trip. Accessibility here measures what the feed publishes, not whether a stop is physically usable. How the conformance mark works.
Can riders use it?
Checks beyond structural validation: places where the feed is valid but a rider still could not travel.
- 18 of 28 boardable stops are never served by any trip. Riders see these stops in apps and on the map but can never catch anything there, which erodes trust in the data. Remove stops no route serves, or add the trips that should call at them.
These do not change the grade. They catch trips with no rideable leg and stops no trip serves, the kind of gap a trip planner trips over.
Below the Google and Apple Maps four-week coverage bar. This feed's last day of service has passed, so Google and Apple Maps will stop showing your agency. Re-export with a calendar that covers at least the next four weeks. The feed also carries 3 validator errors, the other thing Maps checks at onboarding; the findings below name each fix.
How this agency maps to the standards
The scorecard is a data-quality lens, not a compliance determination. Its universal references describe good GTFS and useful rider information. Useful references here are GTFS Schedule Best Practices, GTFS-Realtime Best Practices, MobilityData grading scheme, Google Transit publication guidance, FTA National Transit Database GTFS requirement. Read the full standards crosswalk.
In California, the published guideline is California Transit Data Guidelines. Caltrans' published quality guidelines and compliance checklist; this rubric is anchored to them.
California Minimum GTFS Guidelines checklist (4 of 6 measured items met)
The state's own Data Process Checklist, matched item by item to what this scorecard already measures. An item marked "not measured here" is real ground the checklist covers that this tool does not check; see the official checklist for the full picture.
- Meets Publish GTFS Schedule at a stable, automatically-fetchable URL
The published feed URL downloaded at the last check.
- Not measured here Implement required fields: Fares v2, text-to-speech stop names, shapes.txt, wheelchair_boarding, and Pathways where applicable
This scorecard measures wheelchair_boarding, shapes.txt coverage, fare data, and station pathways separately, below; it does not check the Fares v2 format specifically or text-to-speech stop names.
- Not measured here Achieve a passing score in every category of the MobilityData GTFS Grading Scheme v1
This scorecard automates a proxy for the Grading Scheme's rider-facing fields (see the standards crosswalk) rather than running the scheme itself, which grades by comparison to the real world by hand.
- Not measured here Publish changes to the base schedule at least one week ahead of every service change
This scorecard does not track a feed's publish history, so advance notice cannot be checked.
- Gap Produce no critical errors in the MobilityData GTFS Validator
2 validator errors to resolve.
- Not measured here Publish Trip Updates, Vehicle Positions, and Alerts feeds
This scorecard checks realtime reachability and freshness overall; it does not check for all three feed types individually.
- Not measured here Update Trip Updates and Vehicle Positions at least every 20 seconds
This scorecard samples realtime freshness; it does not check this specific 20-second cadence.
- Not measured here Publish information for at least 99% of vehicles in service
This scorecard measures the share of scheduled trips represented in TripUpdates, a related but different figure than vehicle coverage.
- Not measured here Keep 100% of trip_ids consistent between Schedule and Realtime
This scorecard does not currently check trip_id consistency between the Schedule and Realtime feeds.
- Not measured here Produce no critical errors in the Center for Urban Transportation Research realtime validator
This scorecard does not run the CUTR realtime validator.
- Not measured here Publish accessible feed links on the agency or regional partner website
This scorecard does not check the agency's own website.
- Not measured here Register GTFS and GTFS-Realtime feeds with transit.land and the Mobility Database
This scorecard does not currently check aggregator registration for this section.
- Gap Designate a technical contact in feed_info.txt's feed_contact_email
feed_info.txt has no feed_contact_email or feed_contact_url.
- Meets wheelchair_boarding stated on stops and trips
States wheelchair access on 100% of stops and 100% of trips.
- Meets shapes.txt with a shape for every trip
All 8 trips have a shape in shapes.txt.
- Meets Fare data published, or the service marked fare-free
Fare data is published.
- Correctness 41 / 100
- GTFS Schedule best practices, checked by the MobilityData validator. MobilityData grading covers stop locations, route names, and colors. Google Transit requires a feed to pass validation for publication. FTA NTD readiness also checks that the published feed is valid.
- Freshness 0 / 100
- GTFS Schedule best practices call for a dataset that stays current. An expired calendar can remove service from Google Transit and other rider trip planners. FTA NTD readiness also checks that the published feed is current.
- Rider experience 92 / 100
- GTFS Best Practices for rider-facing fields. MobilityData grading covers stop names and headsigns.
- Realtime quality Not yet published
- GTFS-Realtime best practices: a stable URL, high uptime, and frequent updates.
Part of the California portfolio: the same scorecards for every feed we track in that group, on one free page.
For programs that support several agencies
This scorecard and the board one-pager for Altamont Corridor Express are free, and they stay free. If you support several agencies, as a state program, a technical-assistance center, a feed vendor, or a consultancy, you can buy the program report bundle. It puts this agency's board report in one archive with the reports for the other agencies you support, and each cover carries your program's name, logo, and accent color.
The report for Altamont Corridor Express uses the same numbers as this page: grade F (46.8 out of 100) as of the check on 2026-10-07, its category scores, its top fixes, and its score at each check.
One bundle, up to 25 agencies: $149, paid once, delivered within 2 business days or refunded. Other plans, including a monthly refresh, are on the bundle page.
See a sample bundle report: a real agency's current grade, with placeholder branding.
A purchase buys no influence over grades, methodology, or which agencies are listed. The grade on this page comes from the check on 2026-10-07, scored with rubric v1.4 and MobilityData gtfs-validator 8.0.1. Based on a Mobility Database mirror copy of an archived feed listing. Read how the grade is calculated.
Similar feeds in California
Other scorecards in California, starting with the same kind of service at a similar size. Listed for comparison, not ranked.
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Cite this record
This page updates on every check. The record below does not: it is the dated file this grade came from, published at https://gtfsscorecard.org/data/artifacts/altamont-corridor-express/2026-10-07.json and never overwritten, pinning the grade, category scores, rubric version, validator version, reader archive profile, and the scored feed's sha256 as they stood on 2026-10-07. Use it in a board packet, a regulatory filing, or a research citation instead of linking the live page, whose content will differ on your next visit.
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