BACHMANN Loco Drive 92423 EZ-Riders Ball Bearing Display Rollers - Set of 4

SET OF 4 BALL BEARING EZ-RIDER STATIONARY TEST ROLLERS FOR USE UNDER THE LOCO DRIVE WHEELS FOR SUPPORT WHILE RUNNING IN PLACE ON A DISPLAY  OR TEST TRACK.  THESE WILL WORK WITH ANY LARGE SCALE STEAM ENGINE OR DIESEL LOCO.   THESE ARE ELECTRICALLY CONNECTED TO THE TRACK SIMPLY BY PLACING THEM ON THE TRACK AND THEN THEY TRANSFER POWER TO THE LOCOS WHEELS