Sectional view of a typical British passenger locomotive. A) Fire-box shell, B) Internal fire-box, C) Grate or fire-bars, D) Ash-pan, E) Cylindrical part of boiler, F) Flume-tubes, G) Smoke-box, H) Chimney, I) Steam-dome, J) Steam-chimney, K) Steam-pipe, L) Valve-chest of cylinder, M) Steam-cylinder (not seen), N) Exhaust and blast pipe, O) Slide-valve, P) Piston-rod (not seen), Q) Connecting-rod, R) Driving-crank, S) Driving or crank axle, T) Fore-axle, U) Hind-axle, V) Inside framing, W) Outside framing, X) Foot-plate, Y) Draw-plates, Z) Buffer-beam, a) Fire-door, b) Draught-regulator or ash-pan damper, c) Stays binding fire-box shell, d) Stays supporting fire-box roof, e) Stays binding crown to fire-box roof, f) Stays binding fire-box to smoke box, g) Smoke-box door with closing handle, h) safety-valve, i) Water-gauge and cocks (not seen), j) Water-heating cock, K) Steam-whistle, l) Water blow-off cock (not seen), m) Steam-regulator valve, n) Gear for working regulator-valve, o) St