N Scale Transfer Table?

[Sumpter250]

"1 capstan driven continuous cable to drive the bridge, and keep it aligned. The capstan could be hand operated. The cable run would be from the capstan, around a pulley, attach to one side of the bridge, around another pulley,and back to the capstan end and around two pulleys to the opposite side of the bridge, attach to bridge, and continue to a fifth pulley, then back to the capstan end, around the last pulley and around the capstan completing the loop."

This cable system could also be used to operate a vertical lift bridge..