This WalthersProto HO Scale Passenger Car Interior Constant-Intensity LED Lighting Kit is designed for Walthers full length Budd, ACF and Pullman-Standard passenger cars. This kit will not fit shorter Railway Post Office and Baggage cars. Most WalthersProto passenger cars have built-in provisions for adding one of these Passenger Car Interior Constant-Intensity LED Lighting kits. Fits most WalthersProto (920) or Walthers (932) models Easy drop-in installation Ready for use on DC or DCC layouts Constant intensity lighting for car interior Long-lasting LEDs ensure years of satisfying use Includes all parts to convert one car