A simple, typically British design made by a small company in London. Strangely, the same model can be found designated either model B or C (but not A).
The copper boiler is 1.5" diameter x 3.25". It has a safety valve and steam dome but no water level indication. Steam is fed from the dome, via a compression fitting to the back of the port face of a single acting oscillating cylinder, 5/16" bore x 3/4" stroke. The crank shaft is a simple bent wire type with a 1.25" diameter brass flywheel; supported in a bent steel sheet frame. The whole is mounted on a raised steel base with Meccano compatible holes along two edges. As received, there were a few minor problems which were easily fixed. The original meths burner is missing and it has a modified SEL burner.| Make | Castle |
| Model | B |
| Made | 1950s |
| Description | Stationary |
| Cylinders | 1 |
| Cylinder Type | single acting |
| Piston Diam mm | 9 |
| Stroke mm | 20 |
| Valve Type | Oscillating Cylinder |
| Boiler Type | Horizontal |
| Fuel | Meths |
| Mechanical Condition | Good |
| Cosmetic Condition | Good |
| Paintwork | Original |
| Packaging | |
| Purchased | 5/6/2016 |
| Purchase cost | £79.99 |
| Additional spend |