LMS, the scare led to both companies declaring an unofficial truce. This was only broken the following year by the LNER with A4 Class 4468 ''Mallard'', which reached 126 mph whilst trialling a new quick action braking system.

In 1939, 6220 temporarily swapped identities with 6229 ''Duchess of Hamilton''. The new Coronation was sent on a tour to America for the World's