Third rail DC and overhead AC are both external. There’s a good argument that dual voltage is not multi-mode. The AC traction packages work the same however power is sourced. Dual voltage EMUs were hardly ever referred to as bi-mode in the past.
Yes, even if the unit has dual-voltage capability it's still considered a single mode. I expect that the intent of the multi-mode definition is that the unit needs at least one internal source and at least one external source - which is consistent with the 755 and 769 allocations.
Fair point, but it should be noted that the wording of the specification is "at least one is external". Two is at least one.
If you look into the history of phone number codes they actually make some kind of sense.
*class 755, no it will just stay as 755
745s are AC overhead only so there's no diesel pack to replace. If you mean a 755, then no, because AC + battery is still multi-mode just like DC + battery is for the 777s.
Its more that there is no point in reclassifying them. The 777s aren't classified that way because of batteries, they were classified before the multi mode rule was introduced and they were told to pick a number in the 700 range. They could have picked 727 if they wanted to.
Without going any further off-topic, I knew all of that, (my mother was a GPO/Post Office/BT telephonist for many years) and most of that happened before Ofcom did the damage. My comment was about the mess of 'freephone' vs 'lo-call' 'national rate' 'personal' and 'premium rate' non-geographical number allocations, which Ofcom allowed commercial interests to abuse, - then they underwrote that abuse to the detriment of innocent subscribers.
Ah, yes. A slip of the brain!
