BIG BOY BUILD
By Alberto Celot - Part one

At the end of 2002, I started the design and construction of A model in 5" of the famous American Locomotive Big Boy with a 4-8-8-4 wheel arrangement. The project was fraught with difficulties, but that is why it is particularly fascinating.

The dimensions of the model are rather cumbersome: the locomotive is 2.5m and 3.6m complete with the tender. The firebox is large (220x560mm). Power supply is by an oil burner, previously built and tested with (apparently) good results.


After about 18 months the locomotive chassis was ready for testing.  On the track it was tested to a rail radius of 11.5m, and there were no problems with the double crossover.


I made a lift to handle the ‘monster’ and to save my back! (Ed: note the clever power source)
Above: the front truck. Below mounted at front end.
The rear bogie is fabricated rather than cast, with the various parts MIG welded together.
Below: all the wheels in place.
The boiler is massive, weighing in at 74kg. It is 1.4m long and the barrel diameter is 219mm. It is made entirely from stainless steel and TIG welded by master welder, Robert.

To be able to move the boiler, a special bridge crane was constructed.



PART FIVE HERE   PART SIX HERE   PART SEVEN HERE

















David Carpenter  Editor