Personally, I'd really like to see a Winans camelback.  But that's just 'cause i really like the 1860s-1870s period.
Not sure how much interest there is in Civil War trains nowadays.

Super.  Thanks

Thanks.  May I ask, do you have an example of a 5 amp power pack you can name? 
I don't know of any in DC.

Hmmm.
I'd like to jump in here with a question.
So if I want a bigger layout for my Big Hauler, I should be able to just switch out the stock power supply with a CW-80 80 watt power supply, which is about 5 amps, and that ought to work fine. 
Yes?

Underneath the light you can touch the spots where the bulb is soldered to the arms, and deliver some voltage.  Works on my other similar 4-4-0s.  Bulb's burnt out on this one.  Since the light box is melted in place on the arms I can either break it free and solder a new bulb in place, or just pony up for a new shell, i guess.  I did buy this one used; who knows how old it is.

The HO Jupiter.

For scenery, don't forget there is a substantial variety of historical wargaming miniatures, scenery and buildings out there.  Though 15mm (1/107) and 20mm (1/80) are very common scales, you may be able to find 18mm (1/87 or HO) as well. 

It looks like the bulb has burnt out on one of my 4-4-0 Americans.  Anyone ever tried fixing that?