As part of this work four manual signal boxes were replaced by three power signal boxes, and the semaphore signals and mechanical point linkages were replaced by colour light signals and point motors. The new Bristol Temple Meads East box was the largest on the GWR with 368 miniature levers operated by three signalmen assisted by a "booking boy". The other two boxes were at Bristol Temple Meads West, and controlling the movements in and out of the new Bath Road Depot, which replaced the old B&ER locomotive works in 1934.