Barrister,
This method of connection, i.e. the Fastrack activation trackset, provides power to one or two circuits. Your postwar gateman (No. 145?) most likely has only one, but there were at least two versions of it.
Can you look at it and see if it has two binding posts/fahnstock clips for electrical connections? Or does it have three? This will tell us what we need to know in order to proceed.
Mike
