Garden Railway Forum

Hi and welcome.

The answer to your question really depends on the thorny old question of scale/gauge combination. Building it to run on 45mm doesn't necessarily mean that you have to scale the loco up if you don't want to but if you do, that means you will of course need everything else ( wagons, buildings, etc) scaled up by the same amount.

qh45:103669 wrote: My initial thoughts are to use the 32 mm drawings and to multiply dimensions by 1.4 to get to 45 mm gauge dimensions, and just wondered if this was the correct approach.

There's no 'correct' approach, it's your railway.....

Multiplying all the dimensions by 1.4 will give you a 7/8" scale Quarry Hunslet, if that's what you want.

If you want an SM45 Hunslet, which is basically a 2'6" gauge one, then you just need to make it wider below the footplate. Add 13mm to axles, chassis spacers, etc. and maybe make the footplate and cab wider. There'd be no need to modify the smokebox, boiler, tank and fittings dimensions in this case. Cylinders and valve gear would remain the same as well.

I don't know if Hunslet ever built a 2'6" gauge QH, but there was one built for 3'6" with inside frames and cylinders.

Graeme

Yes, by multiplying the drawings you will get a 7/8ths hunslett but you may need to add another wick to the meths burner or alter the gas burner to make it steam properly. Bigger boiler needs more heat.

Stuart, Roundhouse use a 15mm burner tube in their 50mm boilers and always have plenty of steam. Have a look at their website, they might make a boiler very similar to yours.

The 7/8ths Accucraft Quarry Hunslet is extremely good value for money. Once it's been run in becomes a very controllable loco and will easily run at scale speeds.

http://www.thetraindepartment.com/coal- ... comotives/
Looks interesting!