Hmmm...
1. You're on a vehicle that rides on tracks, and it's themed as such, so, you should indeed see the tracks: 7DMT, BTMR, Mt. Everest, Gringotts, Mummy
2. You're on a vehicle that rides on tracks because it's themed to be a roller coaster, so, you should definitely see the tracks!... Slinky, Incredicoaster
3. You're on a vehicle that rides on tracks, but, we've hidden the tracks (usually by being in the dark or limiting line of sight): RnRC, Space Mountain, many slow dark rides
4. You're on a vehicle that rides on tracks, but is not themed to be riding on tracks, and yet, tracks are still visible, pretend they're not there: Barnstormer, Primeval Whirl, Rip Ride Rocket, Flight of the Hippogryph, Hagrids