The New Zealand Railways Magazine, Volume 2, Issue 2 (June 1, 1927)
Housing
Housing.
All relays, small track transformers, resistances, reactances, lightning guards, fuses, terminal blocks, etc., are housed in wooden boxes at the foot of each signal, the wiring from the tracks and signals is led, in wooden trunking, to these boxes, where the mechanism of the system is protected from weather and dust, and concentrated for ease of maintenance.