How to wire MTH crossing signals w gates

I've just followed these instructions, but without the lock-on - just hardwired to my accessory circuit. Nice, simple and easy. Mine were wired into a Lionel infrared activation device.

Here is some basic electric related to the MTH crossing gates, Isolated rail input.
I used this relay board, no longer available.

Note:
(1.)  Relay board power top, Brown and Red wire.
(2.)  Isolate rail input,  Green wire.
(3.)  Common Blue
(4.)  NO Normally Open Yellow.
(5.)  NC Normally Closed White

(6.)   Gate power, Black and Red  .  In this picture hooked to the rail.  Black outside rail common and Red center rail power.

The remaining three wires are Common (Blue), Normally Open (Yellow), and Normally Close (White), to be powered via the relay.
(7.) Blue and Yellow,  Gate goes down and stays down.  Thumb and forefinger are holding the blue and yellow wires together.

(8.) Blue and White,/ Gate goes up and stays up.  Thumb and forefinger are holding the blue and white wires together.

Basic function of the relay.

For $13 or so, a Z stuff 1008 relay will serve you well.  An isolated rail and a few wire nuts and you are in business.