In 1888, Holden experimented by removing the side rods of T19 No.

[2] One of their main spheres was on the Joint Line working expresses to York.

In 1896 the class inaugurated the epic making non-stop run to North Walsham using oil-firing.

Rous-Martin[4] found that the singles climbed Brentwood Bank more rapidly than the 2-4-0s.

The surviving eight locomotives in the 770-series were transferred to the duplicate list in July 1904, and had their number prefixed with a "0".