what smoke generators are members using in there electric locos

what other main line model locos out there use slide valves. need a new project.after speedy no more piston valves

has anyone that has built speedy had any problems with the valve gear? we built it using the don young modified valve gear.it does run but the exhaust seems to be a beat missing it runs better with the drain cocks open soon as you shut them it seems to slow it down like the exhaust is not getting aw...

has anyone used automatic drain cocks on a piston valve engine