StacksVerified U.S. regulatory reference

49 CFR §229.55

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Brake cylinder piston travel shall be sufficient to provide brake shoe clearance when the brakes are released.
  2. (b)When the brakes are applied on a standing locomotive, the brake cylinder piston travel may not exceed 1 1/2 inches less than the total possible piston travel. The total possible piston travel for each locomotive shall be entered on Form FRA F 6180-49A.
  3. (c)The minimum brake cylinder pressure shall be 30 pounds per square inch.