Our 1954 English Electric DF were of the "old steam era thinking" 4-6+6-4 wheel arrangement aka 2-C+C-2 complete with boiler tube cowcatchers
These 120 ton 1500hp beasts had uneven spaced axles in the C bogies.
The NZR's first true 6-motor units were 1967 built by EE and again had uneven spacing.
Ken Devlin Photo
1971 saw the first GE U-26C arrive with even spaced C trucks, the TM's all arranged the same way. Now these brutes not only pick up the train but can run with it as well.
Our first GMD C-C units in '79 in typical EMD fashion were uneven spacing.