Thanks for that !
I finished the twin launch , and used a gearbox I made , all the posts were on here somewhere .
I sold it for a very nice price , as it was far too big for my usual launch size , and used the cash to buy a hemmens boiler and clyde engine for my latest launch .
Here are some pictures as sold . It did run very smoothe on air and the gearbox was very strong (the guts were for use in a 3.5 cc nitro truck , and were able to take crash changes from forward to reverse (so no problem on a steam engine where crash changes are not the usual option))