I got these - my first Marx accessories - from Trainz for what seemed to be a good price.
The searchlight tower is I'm pretty sure unused. Not a scratch. Everything works. The bell crossing is delightful, but I need to get an outside rail connector from Robert Grossman or elsewhere. Going by the box diagram I presume it's a spring switch that allows the weight of passing wheels to close the circuit that provides track power to intermittently ring the bell(?).
John