Two possible conversions come to mind for me with this set:
1. Mount the engine body on a Big-Haulers mechanism, with some adjustment for the pilot truck wheel spacing and such, or...
2. Mount an Aristocraft or USA Trains 3-axle diesel truck block in the tender, under the tender body shell.
Both should be pretty cheap and would probably make it run better too.
Modeling the D&H in 1984: http://dandhcoloniemain.blogspot.com/
Harry Plopper?
OH..OH !!!!
Get the Garden Railways newsletter delivered to your inbox twice a month