Based on the experience gained with the bulk goods wagons developed from 1954 with metered gravity discharge, the Deutsche Bundesbahn procured various types of construction at several wagon factories from 1959 to 1962. Initially self-unloading wagon without swing roof of the type Otmm 64, redrawn to FC 089 from 1980. Their main focus was the transport of gravel, ore and coal. In order to be able to transport bulk materials that are sensitive to wet matter such as cereals, sugar or chemical goods, the wagons of the category Ktmm(v) 65, from 1968 TD(s) 928, were converted from the above-described design by the installation of a new upper box with hinged roof. Between 1983 and 1986, part of FC 089 was sold to the Deutsche Reichsbahn. From 1988, with the economic period of use, the series of these self-unloading wagons became more and more. Even today, some cars of these types are still mainly used in construction trains as well as in various private railways.This text is machine translate