Not to make you feel bad Lee, but it's only the later steam engines that ran on 200 to 300 Lbs. of pressure. The early engines ran on a lot less. Some things scale down the way you think they should. others don't. Phil.P. Reading,Pa. > Now... If we're done with this bar room brawl over weight vs mass vs metric > vs imperial vs miller vs bud, can somebody PLEASE tell me why my little 13 > POUND Loco requires at least 30 Pounds of steam pressure to even move, while > 200 Pounds of steam will drive a multi-ton critter? > > (Just to keep things on point you understand.) > > I propose a round of Tequila Shots for the house and extra Nachos for the > best answer. I sure as heck don't know what it is. > > Smiles, > > Lee >