This is the RBVZ or Russko-Baltiyskiy Vagonniy Zavod. it is a railway material factory that made several models of engines such as the RVBZ-6 that was installed in the “Ilia Murometz”.

-The RBVZ 6 had the honor of being the first tsarist engine inherited by the Soviet revolutionaries and they changed its name to M-1, (see M-).