A production run of 1,000 were made, with serialized numbers. Minor variations occurred over the production life. One major improvement towards the end of production was the inclusion of a plastic cover over the throttle lever. Mamod changed hands or restructured at least twice in the 1980s When Mamod finally ceased production in the early 1990s, in excess of 10,000 locomotives were made. Towards the end, I believe only the kit locomotive was in production.
Sufficient supplies exist around that new locomotives and kits can still be found.
There is a still a substantial industry offering after-market replacement and enhancement parts such as alcohol burners, safety valves with higher pressure settings, detail parts, etc. Mamod kit locomotive. Early Mamod advertisement. Mamod offerings circa 1989. Frame assembly drawing.