Do you think you will ever offer a N Scale USRA 4-6-2 Light Pacific or USRA 2-8-2 Light Mikado? You would sell thousands. No one makes a decent one. The Model Power locomotives have cast in handrails. Seems like a no brainer.  As well as you have done with all of your other steam locos, I have many, I think it would definitely please the N Scale crowd.

Have you ever considered making a N scale 6 wheel truck Long Haul Tender like the one used behind the Bachmann HO 2-8-4 Berkshire? Most of the east coast 4-8-4's also used them. If you did you would have a close facsimile to what was used on the RF&P, Western Maryland, C&O Greenbrier, etc. I know the L&N 2-8-4's also had a similar tender as did the Southern PS-4 and various C&O 2-8-2's and 4-6-2's. Your off the shelf 4-8-4 would be a nice start linked to one of these. The N&W J-Class Tender is unique to that locomotive but similar in size.