Curt, I like Digitrax stuff, but I had nothing but problems with the Zephyr Xtra I got to replace my old Zephyr. I only upgraded because the newer model had more amperage and functions available. After several trios back to Florida for repairs, I finally gave up and traded it for a couple locomotives, after I found a Super Empire Builder set.
So, if you want a Zephyr for the museum layout, try to find a DCS 50, instead of the DCS 51. If you still need the newer version, see if you can determine when it was made, and get the latest version.
I would recommend a DB 150 set like I have, but it is a large step pricewise upward. You may be better off with an MRC Prodigy Advance set.