Which vendors produces 60 ft boxcars with sliding doors?
Athearn Genesis did make some a few years ago. Other than that, I cannot think of any.
Atlas makes a 60’ ACF with either a Single or Double sliding door. (I glue mine in the closed position).
Walthers makes a 60’ PS with either a Single or Double sliding door. (I do not remember if they operate or note).
IMRC also makes a 60’ PS with a Single Door.
Athearn made a number of 60’ Hi-Cube Boxcars, some had Plug or Sliding Doors, but they were none operating.
Concor also makes a non-operating 60’ Single Sliding Door car which can be a Thrall or Greenville car, but it is based on the old Robbins Rails Greenville Double Plug Door car.
As a general rule the 60’ Cars in Auto Parts service either had double plug doors (Ford Service), or single or double sliding doors (Chrysler and GM Service).
Rick J [2c]
Why dont you try a google search?