It is motion activated. When my trolley goes by, it opens for a few seconds then closes until the trolley goes by again.

You could make your own.

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Are you aware that the steel track has the black roadbed and the nickel silver track has the gray roadbed? The pics I see on Amazon show the black roadbed.

You might be able to use something here by replacing the gates with these.
https://www.azatrax.com/ho-scale-crossing-gates.html
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[/url]https://www.azatrax.com/working-crossing-gates.html[/url]

I spoke too soon. It works with the batteries. It wouldn't work with the power supply.

I got another one in the mail today and I got a power supply. Still no activity. It lights up but no motion. I can still use it. Once you open the door, the door will stay open and you can see Santa in the door waving. I gave the other one to my daughter.

To keep the curves, I bent the track and pinned it to the layout. Then, I went along and put a dab of white glue on the outside of the rail on each tie. Once it dried, I was able to pick up the two track pieces to paint them and they still retained their shape. After that I glued the card stock and tape.

I used regular track. I cut strips of card stock to glue over the ties in the center. On the ends of the ties, I glued strips of 1/4" matte pin stripe tape. That way, it looks more like trolley track and not railroad track. I couldn't use E-Z track because of the 8" radius curve at the near end.  That meant I had to use a different reversing set-up.

I finally got my Bachmann Brill Trolley set-up running. It goes kind of fast but it was hard to program this thing and I'm not going to mess with it. You might want to turn the sound down. It's noisy with my oxygen concentrator running in the  background.
https://youtu.be/sfGe99m50WI

This Switchman Santa isn't a Bachmann item but Bachmann makes trains and accessories for Hawthorne Village  through Bradford Exchange.
https://www.bradfordexchange.com/search/Hawthorne+Village+Trains.html?ta=y

Shucks. I was hoping the power supply was the answer. I doubt that I would know anything if I opened it up.

I ordered the power supply. I don't know if I will get it before Christmas. Shipping says between 21st and 26th. I ordered it from Amazon. I wondered if two batteries were enough to make it move.
I was even talking to Santa to get him to come out in case it was sound activated. I waved my hand in front of it. I put a piece of track in front of it and rolled a car back and forth.
https://www.amazon.com/dp/B0BS68XZ28/ref=pe_386300_440135490_TE_simp_item_image

For what you might spend in parts, this might be a better deal. I don't know if it's a pig in the poke or not.
https://www.ebay.com/itm/295650910996?chn=ps&mkevt=1&mkcid=28

GE U36B
https://www.hattons.co.uk/443218/bachmann_usa_0634bac_u36b_ge_7030_of_the_southern_pacific_lines/stockdetail

I see Hawthorne Village sells a power supply for it for $18. Maybe I'll try that. Might be something else I could use the supply for if this doesn't work.