The recommended way is to use a set of latching relays in line between the AIU and the motor. Have a limit switch open the latch when points are in position or just stall the motor, whichever works best.
If you don't want to do that:
The AIU will pass DC but watch the current, the contacts are not rated for a lot.
Also, just press the button a few times until the switch is fully in place.
The AIU contacts are momentary, they only close for a second or less when you hit the switch. A tortoise type motor needs more time to traverse.
You can use 2 Accessory ports instead as they have a ACT option which holds the relay on as long as you press the button. This uses up your accessory ports fast tho.
By the way, I recommend you get Barrys DCS Companion book, pdf or softcover, available thru the MTH website.
It even gives details on how to drive this type motor in several ways from the AIU.
