| 1. | Unusually, outside admission was used for the piston valves of the cylinders.
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| 2. | It was a cross compound with piston valves across the high-pressure heads.
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| 3. | Superheating was applied in the 1920s, followed by piston valves shortly afterwards.
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| 4. | This work included fitting new cylinders with piston valves and extended smokeboxes.
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| 5. | They were fitted with superheaters, piston valves and Stephenson valve gear.
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| 6. | All five engines had cylinders with piston valves and retained their driving wheels.
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| 7. | Withdrawals of the superheated engines with piston valves began in 1935.
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| 8. | Their piston valves were actuated by Walschaerts valve gear, controlled by steam reversing gear.
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| 9. | The most common custom design used is the piston valve.
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| 10. | It was never used as widely as piston valves or the earlier slide valves.
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