No. 4317 Southern Pacific SD9 with a back mounted SBW-2-300 Mars Light and SBRE-100
Mars Light (top box type unit)
Photo by Ted Benson
The following photos by Kevin Holland show a caboose version of this light.
This light uses a 12 volt motor.
Cover intact
The Locomotive version of this light ran on 64 volts. The motor
(Mars part no. SBRE-27) indicates that the motor voltage is 64 AC-DC.
There was also a 32 volt version of this unit.
