No. 1300, another four-cylinder compound, was an experimental locomotive which differed greatly from all of the others. It was built by Vulcan Foundry in 1905, largely to their own design although to Ivatt's specifications. The boiler had a narrow firebox, a diameter of 5 ft 3 in (1.60 m) and a pressure of 200 lbf/in2 (1,400 kPa). As with no. 292, the high-pressure cylinders were outside, driving the rear coupled wheels, whilst the low-pressure cylinders were inside, driving the front coupled axle; but their dimensions were 14 by 26 in (360 by 660 mm) and 23 by 26 in (580 by 660 mm) respectively. The engine worked as a two-cylinder simple on starting, changing over to compound expansion automatically. A superheater was fitted in 1914, and the engine was rebuilt as a two-cylinder simple in 1917; the new cylinders were outside, 20 by 26 in (510 by 660 mm) of the type used on class H3, driving the leading coupled wheels. It was withdrawn in 1924.[10]

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