Railworks
Irish Rail planned engineering works: affected stations, DART closures, change log and ICS feeds
Provides safe restroom access for transgender, intersex and gender nonconforming individuals.
REFUGE Restrooms API is a free Transportation API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Details from refugerestrooms.org.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Irish Rail planned engineering works: affected stations, DART closures, change log and ICS feeds
Unified traffic data from 65 US/CA jurisdictions: events, cameras, signs, bridges, truck routes
SNCF public API
The REFUGE Restrooms API is provided by REFUGE Restrooms (refugerestrooms.org).
Yes. The REFUGE Restrooms API is listed in the Transportation category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The REFUGE Restrooms API requires no authentication, so you can start making requests without signing up.
CORS support for the REFUGE Restrooms API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The REFUGE Restrooms API is served over HTTPS, so it's safe to use in production.