 In Moscow a number of withdrawn units were rebuilt as trailers, but they were not a success as the ZIS-155 was underpowered and therefore had difficulty pulling a fully loaded trailer, too.From 1955 the ZIS-155 was equipped with an alternator instead of a generator, the first Soviet bus to be so equipped.After Stalin fell out of favour, the ZIS plant was renamed in 1956 to Zavod Imeni Likhacheva (ZIL), after its former director Ivan Alekseevich Likhachev.