 General Railway Signal was known for its "pistol grip" style levers that work slides moving in and out from a horizontal frame.Union Switch and Signal modified the Saxby and Farmer tappet interlocking system, dispensing with the straight lever entirely and placing a rotating crank onto the locking spindle (although in the UK the Westinghouse Brake & Saxby Signal Co. modified this design to resemble a traditionally shaped miniature lever.