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Woodland Scenics BR5878 O Scale Built Up Structure - Interlocking Switch Tower 1S (3.7V) Powerhobby Complete Metal Transmission GearboxWoodland Scenics BR5878 O Scale Built Up Structure Interlocking Switch Tower Trains approaching intersecting rail lines and junctions on a layout will find an important building known as the Interlocking Tower, a new Built & Ready Landmark Structure. A crucial component of the railroad network, these towers house an interlocking track machine that controls train movements through signals, switches and track circuits. This system also guarantees safe