The 154 signal from the postwar era 1945-1969 does not have a circuit board. Like Dtrainmaster says you need a 154c contactor to operate them .The signal made between 1945 to 1949 uses a screw base red bulb 45-76 or 1449-301, the signal made from 1950 to 1969 uses a bayonet red bulb 363-301. The screw bulb just screws out while the bayonet bulb has to be turned and pulled out.
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