Brass Casting: A simple two-legged trolley hook. Many cities used different types of trolley hooks and perhaps had these fabricated in their shops. When mounting these onto the roof, it was a customary practice to off set these slightly (if the company had double-ended cars) so when they were in the barn, and the poles were down, they would not touch one another. Also when being towed (using LRP #002--St. Louis Coupler), on sharp curves, if the poles happen to be down were the coupling is made, the poles could touch on sharp curves. Off setting your poles will reduce these incidents!!