Stirling Single

Model of a GNR 4-2-2 Stirling Single for 5" gauge. Originally drawn by J.K. Scarth, revised by David Piddington. Based on engine No. 664, but with detail differences to cover most of the class, including the preserved No. 1. Drawings and castings are available from AJ Reeves.

The original Scarth drawings are riddled with errors, most of which were corrected at revision. Both require careful study, especially due to detail differences being included without explanation. On the original drawings, this includes two versions of brake gear, alternate bogie centre castings that require the frame drilling differently, and different tender spring hanger detail.

The model also features "joggled" frames, just behind the cylinders, and a taper between the frames between cylinders and buffer beam. This is to increase bogie clearance-the latter taper is a feature of the prototype. Even with this, the design isn't suitable for small radius curves.

The design is reckoned to be suitable for pulling a couple of adults, but is tricky to drive and has limited capacity due to lack of adhesion on the single driver-not unlike the real thing.

Due to all the above, and the lack of build articles, it is generally not recommended for beginners. Nonetheless, it can be built into a pleasing model of a very attractive prototype.