Robinson A5 (GCR Class 9N) Pacific Tank Locomotives

The Great Central Railway (GCR) Class 9N (LNER Class A5) was Robinson's last passenger tank design. They were designed to pull the difficult suburban services out of Marylebone, which they performed admirably for over 30 years.
The GCR built three batches between 1911 and 1917. A fourth batch was ordered by the GCR, but was built after Grouping in 1923. The LNER ordered a fifth and final batch from Hawthorn, Leslie & Co. which was built between 1925 and 1926. This final batch was to fill a shortage of passenger tank locomotives in the North Eastern area. A total of 44 locomotives were built.
The A5s were amongst the first GCR locomotives to have superheaters. The first locomotives had superheaters of the Schmidt type, but over time, Robinson applied his various changes as he developed his own superheater design. This led to a number of different superheater variations existing on the A5s at first. Between 1915 and 1917, they were all brought up to the same standard and had what became known as the Robinson Superheater. Robinson's Superheater expanded the superheater elements into the smoke header, and had a combined blower and circulating valve, to protect the elements from the firebox gases when the regulator was closed.

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Robinson A5 (GCR Class 9N) Pacific Tank Locomotives - Railway-Photography
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Neil