Have been shortening Bach cars for use with small locos on a portable layout with 15"rad.curves.
First to be tried was an unlettered Reefer.
Parts displaced to the right are not used. On body 8 planks are removed from one side of doors and 7 planks from other side. On the roof the walkway is separated working from one end until a razor saw can be used underneath. First cut on roof is immediately to the rear of the ice hatches at that end. Portion of roof to remove can be measured using piece from underframe. Walkway can be trimmed and reglued after roof parts are rejoined
Reassembled Body length--5.25"
A flat car is shortened by cutting underframe as above and cutting deck to suit.
The standart tank will fit on a shorty flat with the ends of the hold-down straps glued into the stake pockets at each end of flat.
Eric UK