To unlock Tin Raceway, get a Super-A License and win the Grand Prix. Then, go to Cloud Hill, and win against the President. After that, if you go to Q's Factory in Cloud Hill, Tin Raceway wil be unlocked. If you haven't done this, it will say 'Under Construction' if you try to select it.

Tin Raceway is a racetrack that is suspended in mid-air. Part of the track takes on the shape of a cog, which is probably why it gets the name 'Tin Raceway'. The cars you race against consist of the inhabitants of Cloud Hill and many of the usual people. They will all have Jet Turbines on, so you may want to be fast before you challenge it. It is also possible to
fall off the track, and if you do so, you'll automatically retire from the race. The good news is, sometimes the other cars fall off the track, and they also retire. The bad news is, this can sometimes mean your teammates will fall off.