Does any one own the MTH premier NP Z6 Challenger?
I do. And the SP&S version as well.
Does it run well?
Of course it does. It is an MTH locomotive.
Seriously, have you ever had an MTH locomotive that didn't run well?
Speed control is smooth down to 1-2 SMPH. It is an exceptionally strong puller, even by MTH standards. Rick said he regularly pulls 18 cars up 2.3% grades with his. That is not even coming close to its limits. The MTH Z-6 can probably handle 36 typical steam era Atlas/Lionel/MTH cars on a 2.3% grade. That is quite close to its real world capability of 1500-2000 tons on a mountain grade.
Any pictures of it?
Here you go.
Is the model accurate or is just another engine (such as the GN version) with the Northern Pacific road name painted on it?
The MTH Z-6 is a very accurate model of the Northern Pacific's first class of 4-6-6-4. They are quite a bit larger than a UP Challenger with a larger fire box and larger diameter boiler. The Sunset model has finer detail in some areas like the front steps. Overall the detail level is very similar with the MTH model having a significant advantage in pulling power and ruggedness. If you want a Z-8 with vestibule cab and centipede tender only Sunset has offered that version.
The first 12 NP Z-6s were delivered from ALCO in 1936, shortly after the UP received their first Challengers. The NP followed up in 1937 with an order to ALCO for 15 more, 9 coal fired locomotives for the NP plus 6 oil fired locomotives for the SP&S. Two of the SP&S locomotives were leased to the GN for use on the Oregon Trunk Line. They were later returned to the SP&S and ran until the end of steam in the 1950s. If you model the NP feel free to run an SP&S locomotive from time to time. The SP&S Challengers and Northerns went east on the NP from Spokane to the Livingston shop for heavy repairs.
MTH offered the Z-6s in four appropriately numbered paint schemes, NP, SP&S and two GN versions. The GN black is historically appropriate. So far as is know the famous Glacier Park paint scheme with light olive green boiler jacket was never applied the the two Z-6s leased to the GN. However, it looks great and ended up being the most commonly ordered version. Without the green GN version there would not have been sufficient orders for MTH to justify tooling up for the project.