One of the mainstays of conventional layout control. This component enables the operation and control of two trains at the same time when they are running conventionally. Has four single-pole, double-throw switches that allow two-cab operation of four blocks. Can also be used as area selectors for a four-cab operation. New heavy duty design compatible with higher amperage AC/DC command control systems and all large-scale trains. May be ganged together in any number to control additional blocks as required.