Need help identifying a Matchbox car accessory?

When I was younger there were connecting tracks that had a piece on it that was detachable. It was bright orange and it allowed the Matchbox cars to be pushed into it, and from there, there was two foam rotating "wheels" (on each side) that propelled the Matchbox car fast down the track. Does anybody know what this was called? It literally was the width of the track and had two foam rotating wheels to propel the car fast down the connected track. Thanks in advance!