Toy slot racing vehicle sets

A toy slot racing vehicle set including a track, at least one slot for guiding an electrically-driven toy vehicle around said track, at least one vehicle having a downward projection extending into said slot and an electric motor for powering said vehicle around said track, a pair of conductors inset into the track, means on said vehicle for picking up electrical power from said conductors, electrical power supply means for those conductors, said means including at least one hand-held controller having means to vary the electrical power applied across the conductors so as in turn to vary the speed of the toy vehicle, and switch means on said hand-held controller for providing a short circuit between said two conductors, whereby when said switch means are operated and the two conductors short-circuited, said electrical motor in said vehicle will act in a regenerative sense producing an electrical current which is short-circuited and thereby provides braking for said vehicle.