So a few questions on Class 37s I'm hoping people can assist with!
Q. Which locos were series 1, 2 and 3?
I know that D6700-D6818 were series 1 locos, and that D6600-D6608 were series 3 locos, but where was the split between series 2 and series 3 with D6819-D6999?
Q. What were the differences...