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Union Pacific 4-8-8-4 big boy with coal car. The locomotive is designed for a 44mm motorized chassis. The front boggie of the motorized chassis is hidden from view by the first set of 8 wheels. some of the boggie's embossed detail may need to be sanded off for additional movement. The front of the locomotive is designed to articulate. A separate boggie will need to be installed at the front of the locomotive.
The coal car can be motorized with a 35.5 mm motorized chassis.