StacksVerified U.S. regulatory reference

49 CFR §236.712

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
A pipe running from the engineman's brake valve through the train, used for the transmission of air under pressure to charge and actuate the automatic brake equipment and charge the reservoirs of the electro-pneumatic brake equipment on each vehicle of the train.