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Thanks for the reply.  My concern, or maybe curiosity, was the 3 wires going into it...  obviously(?) track voltage, ground, and ????? ! I was planning on running wheat bulbs over wheels on the head-lite circuit of PS3 wiring.  Do you have any new or used fan driven smoke units available,  I'm not afraid to cut a PS1 smoke board but I'd rather not do that.!  Thanks for your reply to me and all the other advice to others

I'd have to see what the board looks like.  Truthfully, I have a box of these.  When I do an upgrade, either TMCC or PS2/3 to a brass Weaver/Williams/3rd Rail locomotive, I rip all that stuff out first, I don't spend a lot of time worrying how it's wired.

You can typically put at least three 60ma bulbs on the headlight circuit of the PS/2 boards, and I suspect the PS/3 piggyback board is similar.  For the ground lights, I'd consider wiring up some chip LED's so you can have three or four on a side, you don't want to overload the headlight circuit. 

You can still get smoke units from MTH, I most commonly use the AA-0000070 Smoke Unit. You have to decide on what mounting you need.  All the brass locomotives I've done require some sort of custom mount.  Some I use a spring epoxied to the base to just hold it in place in the stack, in which case I chop off the mounting posts.  You also will need to extend the stack on the smoke unit to properly route the smoke.  I use the AA-0000102 Brass Cup to solder my brass tubing extension to, then I can just screw it into the smoke unit.

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