Blue Square with diagonal cream stripe

In mid-1958 when Cravens cars were delivered to the Lincoln area they were found to be incompatible with the Class 114s, despite both being Blue Square. The reason given was that the Derby's had Leyland engines and the Cravens AEC, and there were minor variations in wiring. Until this could be sorted, to avoid them being coupled the Class 114's received a diagonal cream stripe on their blue square.

At the opposite side of the country, the same code was used on a Class 116 set with different gear ration in it's final drive.