Two train sets were built with significant differences in construction. The day train, "Senator", consisted of seven cars, including the front and rear engine unit. The cars were connected by single Jacobs axles. Only the first bogies of the power units were twin-axle bogies, both axles being powered. The "Senator" was on duty between Hamburg and Frankfurt/Main from May 1954 until November 1957. The night train, "Komet", was different from the "Senator" though its shape looked similar at first sight. Its livery was notably different. Instead of single Jacobs axles connecting the cars, twin-axle Jacobs bogies were used. The "Komet" was delivered with 7 cars from the outset and soon afterwards equipped with an additional dining car. All available online pictures show the Komet with 8 cars. In 1956, an additional car was built for the first foreign journey by a German President after the Second World War. Due to the train's limited power, another car had to be taken out of the train in order to accommodate car 551i. The conference car is the only surviving unit. "Komet" had better driving characteristics than "Senator", which was described as behaving a bit like a goods wagon. "Komet" was in service between Zurich and Hamburg from May 1954 until December 1960 and was operated by the DSG.
Technical data
The VT 10 501 was built by Linke-Hofmann-Busch in 1953 for the Deutsche Bundesbahn. It was designed as a seven-unit train. Every pair of intermediate cars had a common Jacobs axle; only the power cars had twin-axled, powered bogies. The VT 10 551 built in 1953 for the Deutsche Schlafwagen- und Speisewagengesellschaft by Wegmann in Kassel and taken over on 1 January 1955 by the Deutsche Bundesbahn. The trailer cars were linked by twin-axled Jacobs bogies; the power cars had twin-axled, powered bogies. Each power car was equipped with two MAN diesel engines of Type D 1548 G, each developing. Later, the power was increased to per engine. The original version had a top speed of ; the later version could attain this speed was never used in the time table. To supply power to the train, two additional diesel engines were installed, each capable of. Power transmission was hydraulic with a mechanical four-way gearbox.
