Circuitron
Snapper Switch Machine Power Supply

Walthers Part # 800-5303, p. 290 Walthers 2012 HO Scale Reference
A scale, $34.95, currently in stock at Walthers

 
Solid state, provides positive power to dual-coil switch machines. Protects from burnout due to stuck pushbuttons, short circuits, etc. Operates off accessory terminals of power pack or transformer up to 25V. 24V input can activate 5 to 10 coils simultaneously if connected to same control. Instant recycle time. Includes a section of Printed Circuit Mounting Track (PCMT).