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