Class numbers in the 70s Was 7 under TOPS reserved for electro diesels or for DC diesels Empirically the Woodhead locos 76 77 do indeed suggest that the 7 series vs the 8 series was for indeed for DC locos catenary or 3rd rail However I ve never seen it claimed that this was particularly deliberate whilst I have read that the electro diesels were deliberately grouped in this range Does anyone have a robust source In the meantime I ve reverted the change mostly to avoid the redlink If we do change this the link ought to point to a section within the TOPS article