Abstract: A toy vehicle with noisemaker includes a closed rectangular resonating chamber with a hard flexible diaphragm forming the upper chamber surface. An idler wheel in the gear train between the vehicle's electric motor and the driven rear wheels has cam profiles molded in its flat surface. A hammer pin extending through a rigid chamber wall rides on the cam profiles and continuously and alternately flexes and releases the diaphragm. When released, the diaphragm unflexes and drives against a rigid stop. The impact of the hard diaphragm against the stop oscillates the diaphragm and causes a sound which the resonating chamber amplifies. The sound is produced twice with each revolution of the idler wheel.

Abstract: A method and apparatus is provided for simultaneously starting a plurality of model vehicles on a race track section constructed and arranged to be interconnected with adjacent track sections. The model vehicles are normally powered over the race track running surface by their driving wheels and are directed along the running surface by guide pins which are attached to the vehicles and which are inserted within recessed guide grooves within the race track. The vehicles are restrained from movement along the running surface by stop members which block the movement of the guide pins through the guide grooves. The model vehicles are simultaneously permitted to commence movement along the running surface of the track section by the stop members being simultaneously removed from blocking the pins of the vehicles thereby accurately simulating a racing start.