Thanks Snkbittin and John for your input.
Would love to know how various locomotives typically do when left idle for a year, 5 years, 10 years, 20 years, etc.
With Postwar, my guess is they are usually fine if not run for a long time and kept in a dry and moderate temperature environment. However, as a precaution I would lubricate after not running them for over a year.
What about MTH Proto 3, Legacy, TMCC, Williams, K Line, etc.?
Arnold