This example uses one Two Relay Controller for a block signal, with two short isolated outside track sections to establish a track block. A train is "in" the block, and the block signal activated, from entering the first track section to leaving the second one, including within the non-isolated outside-rail track segment between the isolated outside-rail tracks sections.

The example shows a controller for each of two consecutive block signals. One isolated outside-rail track section is shared for the end of one block and the start of the next.

A separate 12 - 14 volt transformer is used to power the 2RC controllers. Power for the outside-rail input common is connected to train/center-rail power.

Jumpers are configured for the "Train-Between-Track-Blocks" feature set. Relay-1 is jumpered for the OFF/ON feature. Relay-2 is jumpered for the SLOW-FLASH feature.

Block signal "A" is connected so that the "green" light is normally ON. The "red" light is "ON" and the "green" light is OFF when a train enters the track block. When the train enters the following block, the "red" light flashes. The "red" light is OFF and the "green" light ON when the train leaves the block.

Block signal "B" is connected for simple "green/red" operation, but can be made to flash if there is a following track block controller.

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