Modifying two rail rolling stock for use on 3 rail layouts (HI RAIL Forum)
The attached photos show an Atlas ACF 60 foot single door auto parts boxcar (2 rail version) with extended coupler box. The extended coupler boxes on this model are very realistic.
Since my layout operates 3 rail equipment it was decided to use a few "coupler conversion" cars that have 2 rail (Kadee) couplers on one end and conventional three rail couplers on the other. This would allow use of the 2-rail equipment along with 3 rail equipment. Changing out the Atlas trucks on the Atlas car with 3-rail trucks is also required.