Bachmann Trains Thomas & Friends MAVIS Locomotive w/Moving Eyes. Build your Thomas and friends collection one friend at a time. Compatible with Bachmann HO Scale E-Z Track and other popular brands of HO Scale Track. Metal wheels. International style hook and loop couplers. Mavis locomotive with moving eyes. Build your Thomas and friends collection one friend at time. Compatible with Bachmann HO Scale E-Z Track and other popular brands of HO Scale Track. Metal wheels. International style hook and loop couplers.