The Proto 1000 HO-Scale 31698 Union Pacific #651A & #654B Erie-Built Locomotives are model trains that accurately replicate the Erie-built locomotives for the Union Pacific Railroad. These diesel locomotives are powered by DC and feature a yellow color scheme, light function, and limited edition status. Made of plastic and diecast materials, they are ready to go out of the box and can be controlled with an analog control system. With a scale of 1:87 and designed for a two-rail system, these locomotives are perfect for model railroad enthusiasts looking to add a piece of history to their collection.