I guess I didn't get the memo. I took a break from painting and decaling my own stuff (of about a year) and just recently caught the bug again only to find that nobody carries MT undec rolling stock. When did this happen and how did I miss it? Now I need a hard to find car (actually two straight sided flats...a VERY unpopular car) for a kitbash and NOBODY has them. I guess I'm just venting, forgive me...
There was a move away from kits and undecorated models since the early 2000s, but they're coming back in popularity it seems. That being said, N scale needs a manufacturer comparable to Accurail in HO!
Try a google search. I turned up this https://www.ebay.com/i/401696980581?chn=ps Some paint stripper and walla an undec flat.
There is a separate thread that identifies the specific item wanted: http://www.trainboard.com/highball/index.php?threads/mt-undec-44000-straight-sided-flat-cars.123132/
Yeah those: 44000 straight sided flat cars. I need to make some 40' straight sided flat idler cars to switch my car float.