Bidirectional signalling is easier to implement when under the control of one signal box. Some early signals protruded from the roof of the controlling signal box. This proceeded as a volunteer project, including the building of a signal box. This layout also included a turntable to the rear of the signal box. This includes the cost of any interlocking tower or signal box. The sidings in front of New Street signal box have also been removed. The station had a large goods yard controlled from a signal box. The points were operated by a 120-volt supply from the signal box. James Holmes was the signalman at Manor House signal box. This resulted in the closure of Glenfinnan signal box (amongst others). Future developments are to include a carriage shed and signal box. This filament fail relay also activates an alarm in the signal box. Another landed on the railway signal box, killing the signalman. Both station and signal box are Grade II listed buildings. On the causeway is a signal box.