Brawa 46083 - Passenger Coach B4yg DB III
Due to the great lack of travel Cars and express train Cars following World War 2 and the generally poor condition of the vehicle fleet, a conversion campaign for four-axle Cars was announced as early as the presentation of the three-axle conversion Cars. In terms of design, the development of the 4yg Cars was very closely linked to the 3yg Cars which lead to the assumption of numerous components. Therefore, the similarity of both Car types is unmistakable. However, the 4yg Cars were given a central entrance that had already proven itself with the new 26.4 m city express train Cars and lead to a symmetrical distribution. The majority of donator Cars were Prussian-type 4-axle compartment Cars. The vehicle frames of the donator Cars were all brought to a uniform length of 19, 460 mm and then firmly attached to the new steel construction. The first trial Cars were delivered in 1955 by Aw Hannover [Hanover Railway Workshop]. In the subsequent years up to the start of the 1960s, over 1800 Cars of the three main categories, AB4yg, B4yg and BPw4yg, were manufactured. Refurbished standard Prussian design bogies as well as swan-neck bogies were used for the Cars manufactured up to 1958. After 1958, the newly-developed light Minden-Deutz bogies were installed. In order to ensure independent utilisation with all three types of traction, all Cars were equipped with both steam and electric heating. Due to the late delivery of the AB4yg, it was not possible to create trains of a single type from the start. For this reason, A or AB pre-war express train Cars were usually deployed in trains made up of B4yg Cars until 1958. In doing so, the Cars were distributed across the whole of Germany. However, the actual plan of withdrawing all Cars from service by 1.1.1990 did not come to fruition as reunification caused an increase in the demand for Cars. As a result, some Cars even made it as far as Berlin. The last 4yg Cars were finally withdrawn from the Deutsche Bahn fleet on 28.2.1994.