[1] Between 1902 and 1904, they were all re-boilered with more traditional boilers similar to those fitted to the NER Class H locomotives.
560) acquired the chime whistle from the LNER Class A4 4469 Sir Ralph Wedgewood when it was damaged during an air raid on York in 1942.
The NER built the K class specifically to shunt the docks at Hull,[1] and it was here that they performed for most of their lives.
During World War I No.559 was used both at Woolwich Arsenal and by the Royal Engineers near the mouth of the Humber Estuary.
After years of speculation, in 2022 the Beamish Museum announced plans to build a new K Class engine where its small size and marine type boiler are seen as perfect for the museum's short demonstration line.