The Atlas Twin consists of a pair of double-pole double-throw switches internally connected to allow independent electrical polarity control at either of the two pairs of output (upper) terminals. It provides a simple means for controlling reversing loops or simple double track layouts. It can also provide a simple method for controlling turntables, sidings, wyes, etc. Any number of Twins can be ganged (coupled) together without additional wiring by using the double-ended connectors provided.