SECR 399 1922-07 Slade Green shed
SER Q 0-4-4T No 399 at Slade Green shed, south east corner in July 1922.
The wagon in the background looks very much like the Hurst Nelson batch of 'RCH' coal wagons (later SR diagram 1359) delivered 1914-15. It's also carrying 'Maunsell' lettering - the relatively large initials - suggesting it may not be any earlier than 1917 (based on info in SR Wagons Vol 3, King, OPC).
Photo: A.W. Croughton / Rail Archive Stephenson