Passengers rode either in wide coach seats or private first-class sleeping compartments while their vehicles were carried in enclosed autoracks. The train included dining cars and meals were served. The equipment of the Auto-Train Corporation was painted in red, white, and purple colors. The typical train was equipped with two or three General Electric U36B diesel-electric locomotives, double-deck auto carriers, streamlined passenger cars, including coaches, dining cars, sleeping cars, and full-dome cars, and a caboose, then an unusual sight on most passenger trains. Auto-Train's first auto carriers were acquired used, and started life in the 1950s as an innovation of the Canadian National (CN) Railroad. The CN bi-level autorack cars had end-doors. They were huge by the standards of the time; each 75-footer (23.86 m) could carry eight vehicles.