No.956 was first given a different variation of the standard arrangement, then brought into line with No.959, but by the end of 1922 both had been altered again, this time to the same mixed gear arrangement as 957/958.
No.956 was first given a different variation of the standard arrangement. The standard arrangement was then brought into line with No.959. Both had been altered again, this time to the same mixed gear arrangement as 957/958. This was by the end of 1922.