‘Brute force’ is what you need. Check out this massive piece! Union Pacific (unpainted) by Overland Models Inc., OMI #0349 built in 09/1997, UP SD90AC for road numbers #8200 - 8201. Test ran excellent in forward and reverse. Powered by Large Pittman Can motor with Dual Fly-Wheel for coasting ability this ‘Heavy Weight Champion’ comes in at 8 pounds! No lights. Parts bag included with all window glazings. Original box in good condition shows some wear. Only five unpainted were built in this year. This piece is rare and hard to find especially in excellent condition.