Lionel's Gantry Signal Bridge No. 452 uses the 153C Contactor to activate the signal...just like it's big brother No. 450 signal bridge.
As most Lionel operators know, the 153C is activated when the weight of the train passes over it. Unfortunately, the 153C losses adjustment, and needs to be occasionally tweaked in order for it to function correctly.
Has anyone found a way to use insulated track sections to operate this accessory? Would appreciate any suggestions you may have.