Frank S, while not really a "tinplate" loco, is constructed almost entirely of metal, including heavy gauge brass, diecast frames (loco & tender) plus a silver-soldered copper (boiler), and various other metal components. In 1989, LGB commisioned Aster of Japan to construct a 1:22.5 live steam model of an actual narrow gauge operating German steam loco, named Frank S for an anonymous preservation donor.
LGB stipulated that this Aster model be relatively easy to fire and run. Hence, the Frank S uses a mixture of butane and isobutane as fuel, and has such features as oversize throttle and gas valve knobs, a pressure gauge, a water-level sight glass, boiler-fill plug, reverse lever and pressure relief valve. It also has an easily accesssible valve oil lubricator.
In practice, Frank S is best controlled manually when running at "tabletop" level, so one can catch up and operate the throttle and gas valves.
Frank S runs ideally on steam-distilled water, highly purified butane fuel (NOT Ronson), and a good quality medium viscosity steam valve oil.
Running miniature live steam is fairly messy, since the stack initially releases a mixture of hot water and valve oil onto the tracks and adjacent areas! Hence, it is best NOT to run live steam and electric locos on the same track.
The Frank S is a powerful little loco that can pull several LGB 300mm coaches for about 20-25 minutes running time before a water and fuel refill.
All in all, a nice introduction to live steam operation with a minimum of fuss!