Use plastic card (styrene sheet) to make the roof.Remove the roofwalk first,clean it up and fix it onto the finished roof.Add weight inside the body before you fit the roof. Based on the rolling stock of the Ohio River & Western Railway. This model is designed for N gauge couplers (microtrains 1015).These can be screwed to the mounting block at each end. Instructions.
Now with separate brake parts, giving the choice of air, vacuum, or no automatic brake.
Roof hatches, open or closed, are available separately.