Internal combustion engines, including diesel engines for stationary and marine purposes, gas engines, dual fuel engines - namely, internal combustion engines for both gaseous and liquid fuels; in-line "V" type and radial engines; engine-compressor units; engine-pumping units; controls for internal combustion engines; gears, including speed changing gears; power-driven hoists; friction type hoists; rock, ore and gravel crushers, including cone and jaw crushers, gyratory crushers, impact crushers, and gyratory fine grinders; vibrating screens for screening rocks and ores; ball mills and grinders; rotary kilns; autogenous mills, tube mills, rod mills and pebble mills; vertically axised screens, rod decks and rod grizzlies, bar grizzlies; conveyor drive pulleys and brakes; lubricating systems and parts; track working equipment, including cribbing and ballasting machines, adzing machines, track Jacks, track grinders, rail grinders; tampers, spike drivers, spike pullers, rail drills, track-supported screening assemblies for screening ballast before it is returned to place; nut and bolt screwing and unscrewing devices - namely, power socket wrenches for nuts and bolts of track rails; ballast routers; machinery for cleaning and maintaining railway yards and railway lines; track gauging machines; tie pullers and inserters; line indicators; rail lifters; scarifier-inserters; screens and screen assemblies for railroad use; spike hammers; spike pullers-hydraulic and mechanical; tamping