For heavy duty gantry cranes, an electric control room need to be made on the girders, or the electric control boxes can be built-inside the crane girders.

For small capacity gantry crane, there are just electric control boxes on the girders, while for heavy duty gantry cranes, an electric control room need to be made on the girders, or the electric control boxes can be built-inside the crane girders, because the girder spance is big enough to set up an electric control room in it.