https://www.lner.info/locos/V/v2.php

The Gresley V2 2-6-2 Prairie 'Green Arrow' Class
The V2s were the LNER's most famous mixed traffic design, and they were one of Gresley's most successful locomotive types. The design can be traced back to 1932 when a modification of the K3 2-6-0 was being considered. This modification included a rear bogie which was shared with the tender and was described a 2-6-4-4.