Mark Newton and other members interested in the JNR steam to diesel transition era may enjoy this little video of action on the Kansai main line in the very end of steam operations on this stretch of railway. It looks like d51 workings have ended on the head end of trains, but still used for banking operations over the Kabutogoe Pass. Especially interesting is the segment starting at 2:23, of a cement(?) and/or chemical train headed by a dd51/df50 combi and banked by a d51- would be a great consist to model.
There are many other videos on Youtube of this very interesting segment of single track mainline circa late 60s to early 70s, well worth the time to check out.