Was the sole lo­co­mo­tive run­ning on the world’s first pre­served rail­way in 1951

Steam Railway (UK) - - Wheel Arrangments -

and 4 were pur­chased in the 1950s), was an 0-4-0T with a wheel­base of 6ft 6in, com­pared to Ta­lyl­lyn’s 4ft. To achieve this, the rear axle was placed be­hind the fire­box, ne­ces­si­tat­ing the valve gear to work off the front axle. Fletcher’s Patent valve gear al­lowed this, which was es­sen­tially Al­lan’s straight link valve gear dou­bled back on it­self just be­fore it reached the fire­box. This also meant that the ec­centrics were on the front axle, whereas the pis­ton rod con­nected to the rear axle. Al­though an in­ge­nious method, it does re­sult in a side-to-side os­cil­la­tion above a cer­tain speed - though this was worse when de­liv­ered than it is today, for the crankpins were short­ened

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