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More than 6,145 DB express train wagons are known as UIC-X wagons. These cars had a level of comfort that was previously unknown in Europe. The development of express train passenger cars in the new standard length of 26.4 m was initiated in 1950. The Westwaggon wagon factory in Cologne-Deutz was in charge here according to the specifications of the wagon construction and purchasing department of the Federal Railways Central Office in Minden. All cars were fitted with Minden-Deutz bogies.
Prototype: At the end of the 1960s, the DB considered how to give its fleet of cars a modern and friendly look. From 1970 to 1974, new, lighter colors were experimented with, with the basic color of the car bodies of all vehicles being pebble grey. The roofs were painted in umbra gray. On most passenger coaches, there was a decorative stripe in pebble gray and a decorative stripe in the color of the respective window strip above the frame. In the vernacular, the eye-catching vehicles were referred to as "Popwagen". Six different window colors including decorative strips were used on almost all types of DB express train carriages.