Gazette Extra Board

Introducing the Grand Junk Railroad: Converting an HOn30 Diorama into a Mini-layout

Loop construction began with three lengths of Peco HOn30 flex track pinned over cardboard templates. Once finalized, the track’s oval shape will be retained with a series of printed circuit board (PCB) ties soldered to the rails at periodic intervals along each curve, and at the ends.

Introducing the Grand Junk Railroad: Converting an HOn30 Diorama into a Mini-layout

Sam Swanson/photos by the author

With the increased interest in small table top layouts displayed at meets and conventions, I considered how several dioramas extracted from previous HOn3 and On30 layouts could be converted into mini-layouts (albeit in unconventional configurations).

With the track geometry defined by a series of T-pins, PCB ties were placed in pairs at each end (allowing the curved shape to be maintained and withstand repeated handling). A dab of flux was placed on the underside of each rail base, where the tie would be soldered. The tie was slid into place on an emery board (serving as a heat shield), and then the rail pressed into the flux blob. Using a 30-watt iron and heating the outside of the tie/rail intersection and then touching the area with thin-diameter solder, the molten metal flowed under the rail and secured it. If necessary, a quick touch on the inside with the iron will encourage full solder distribution over the inside of the rail base. If your track is painted, be sure to file off any paint in the PCB area for a solid soldered connection.

Following completion of my salvage yard square-footer diorama (as described in the January/February 2026 GAZETTE), I had a variety of junk components left over which conveniently could be applied to rolling stock and right-of-way detailing).

Ready to be unloaded, the Grand Junk Railroad local advances toward its destination, King of the Hill Auto Wreckers.

Combining the diorama with curved lengths of XPS (extruded polystyrene) insulation foam and HOn30 flex track, along with a set of magnets, allowed the mini-layout to come together rather rapidly…


Read the rest of this article in the November/December 2026 issue of Narrow Gauge & Short Line Gazette. Subscribe Today!