Three-Rail Innovations' Two-Relay Controller gives the toy train operator a single device that can be configured for operating trackside accessories, controlling trains, providing train safety, operating track switches, and cycling lighted layout accessories.

There are two inputs that are connected to isolated-rail track blocks or electrical switches and two single-position-double-throw (SPDT) relays. Jumpers are placed across two columns of eight pins to select the operating features to be activated.

The Two-Relay Controller is an electronic circuit board, approximately 3.0 inches by 2.8 inches. Electronic components provide complete isolation among inputs, outputs, Controller power, and the Controller's circuitry. A small microprocessor is used for all logic, control, and timing functions.

The 2RC circuit board is arranged with a wire connector for inputs on the bottom-left and wire connectors for board power and relay outputs on the right. There is also a block of jumper pins in the upper-left.

The controller uses LEDs to show activity. A status LED shows power and proper operation. Two LEDs glow to show that a relay is activated.

Jumpers are placed for feature selection.

Wire connections are made for inputs, board power, and relays.

LEDs indicate power ON and relay activation.

The 2RC uses insulated outside-rail track sections to sense a train and SPDT (single-position- double-throw) relays activate accessories, train power, track switches, or lighting.

Wires from insulated rail track sections go to the outside-rail inputs connector. Inputs are powered from a fixed-voltage, AC transformer between eight and twenty volts or from train power. Connections consume very little power: a hundred active input connections can be driven with a one-ampere transformer.

Accessories are wired to the relay terminals. Each of the two sets of relay normally-open and normally-closed contacts can switch up to eight amperes of AC or DC power at up to forty volts.

The 2RC circuit board is powered by an AC transformer between twelve and fourteen volts. The controller uses little power; ten controllers can be powered from one ampere of power.

Three-Rail Innovations' Two-Relay Controller is expressly designed for the toy train operator and to be used on a toy train layout.

The following table provides operating specifications for the 2RC.