Introduced: 1979 Discontinued: this engine is still in production. Replaced: Se1a Se2a Number produced at the end of 1995: 41,191 Minor Variations in the type:
The SP4 (Steam power 4) was the middle engine of the range. It featured the standard Mamod boiler and die cast chimney. This engine frame for this engine was mounted on a silver plinth. This engine had a reverser which allowed the user to make the engine run in reverse or forward. It could drive the all the tools easily. This engine’s exhaust was sent down some pipes and actually went up the chimney so the chimney would be seen with all the exhaust steam blowing up it. The problem with this was the steam often condensed in the bottom and would settle there also all oil would be left there too.
