StacksVerified U.S. regulatory reference

49 CFR §234.259

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each crossing warning system shall be tested for the prescribed warning time at least once every 12 months and when the warning system is modified because of a change in train speeds. Electronic devices that accurately determine actual warning time may be used in performing such tests.