ATLAS #1231-1 UNION PACIFIC ERIE BUILT TRAINMASTER A UNIT WITH DUAL MOTOR DRIVE, TMCC AND RAISLSOUNDS, DIECAST FRAME, DIECAST TRUCKS, METAL GEARS, WHEELS AND COUPLERS. ALL FUNCTIONS WORK AS DESIGNED. NO MISSING PARTS. ATLAS #1233 UNION PACIFIC ERIE BUILT TRAINMASTER B UNIT IS NON POWERED AND IS ALSO IN LIKE NEW, EXCELLENT CONDITION.THE A UNIT IS AN EXCEPTIONAL PULLER!