From Sonic Retro
Rhino Liners are speedy robots that run along a railroad track. The player must always be cautious when grinding on a rail with a Rhino Liner on it as they can be knocked of the rail and fall to their demise. The best way to destroy a Rhino Liner is with Thunder Shoot.
Some Rhino Liners will drop spike balls from behind them which can knock players off rails.
Sonic Rivals 2 card 90