Atlas Model Railroad Co.
Atlas Master(TM) ACF(R) 50' Precision Design Smooth Side Boxcar Assembled

Chessie System/WM #35218 (blue, yellow)
Walthers Part # 150-13374, p. 192 Walthers 2012 HO Scale Reference
HO scale, $25.95, sold out at Walthers

 
Built by ACF in the late 1960s and early 1970s, this ready-to-run model features a prototypically detailed body with recessed "Precision Design" panels adjacent to the single door. Standard features include sliding doors, 70-ton roller-bearing trucks, realistic ladders, brake wheel and see-through end crossover walkway, detailed diecast metal underframe, separate brake system and air reservoir, as well as AccuMate couplers. Cars also feature accurate painting and printing to match the prototype.