john prytherch
Member
- Joined
- 27 Feb 2013
- Messages
- 89
They were, but the Hadfield/Glossop units were not designated Class 506 until the introduction of TOPS either, several years after the conversion. TOPS did use an entirely logical numbering system at first with similar units or different unit types operating in the same area e.g. 306/506 were the LNER units and 104/304/504 running most of the other Manchester services.
There's an excellent article "DC to AC" by Eric Stuart in the September 2021 issue of British Railways Illustrated (Vol 30 No 12) at pp.520-527. It covers much of the ground in this thread including the GE and LT&S changeover dates. As well as some general electrification history. Its only tiny error is in saying that Metrolink is now 1500 v dc (It's 750 v isn't it?)
If anybody would like the magazine, please let me know and I can post it on. I'm always trying to declutter!