 710, prototype of the well-known T19 Class, which was to prove the mainstay of Great Eastern main line passenger service for many years.While the new engine closely resembled one of the Worsdell Class G14s, the boiler was slightly larger, with 1,230 as against 1,200 sq ft (114 m² and 111 m²) heating surface, and 18.0 as compared with 17.3 sq ft (1.67 vs. 1.61 m²) grate area; cylinders were 18 in by 24 in, and weight in working order 42 long tons (43 t).Building of these engines continued for eleven years, from 1886 to 1897, until there were 110 of them in all.