Following on from last week, here we are installing the detection for the new signals. These are only allowed to be pulled off when the associated trap point is in the correct position. It is, in effect, a mechanical logic gate.
The signal is the auxilliary one by the trap point at the right, on the run-round loop. The train seen in the left-hand platform is an auto train, and the engine doesn't need to run round it's train.

 This is a close up of the detection connected to the wires from the signal box.

 This is the lower signal pulled off during testing.

 And this shows the detection for this signal pulled off. (The one on the right.)