Insulated Rail Relay Based Sensor

Correct.  Note that the two interconnecting wires carry DC voltage so polarity is important.  RTR12 makes this clear with his use of the Red wire for DC+ and Black wire for DC-.  On the ITSD side they go exactly as he shows.  The relay board presumably will be as pictured, but in any event the white label "VCC" gets positive or DC+ (Red).

Since you've already installed the relay, I suggest you simply leave it in place and attach the red and black wires under the board to the same two pads.  Your application is somewhat unique in that the external relay triggers/closes for at most 1/2 sec.  This is materially different than having both relays closing for many seconds or indefinitely if the train stops on the insulated rail section.

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