The Block Control Signal No. 253 would change from RED to GREEN as a train entered an insulated block section that was usually placed in front a station. The lamps in the signal are the dual pin type.

This signal featured automatic train control that would stop a train in the insulated track section(s). The duration of the stop was controlled by a lever that is to the rear of the ladder and it controls a switch that was triggered thermostatically. Available from 1956 until 1959, there are no variations.

Dimensions: 7" high, base: 4" long x 2" wide.