Each diagram will cover one return journey every two hours, equals 8 diagrams (at 4tph), equals 16 units in the peak (doubled up), so say 20 units including an allowance for availability. So no, I don't think I am confusing trains with vehicles. On the contrary, I think the Abellio website is the one confusing trains with vehicles.
The most recent diagrams I have seen online show that 22 Class 170 units are diagrammed for Edinburgh-Glasgow QS via Falkirk High for all or part of the day (Mon-Fri). There are a further 5 units stabled (some unavailable for maintenance and those that are available for cover will be for cover across the network and not just E-G). My earlier comment that 'more than half' of the Class 170s were diagrammed for E-G was wrong. I should have said 'around half'. Apologies.
That's from 2011 diagrams available to read by registered users of
http://www.scot-rail.co.uk/page/Diagrams:Class+170+SX+May+2011. I've no reason to believe diagrams have substantially changed in the intervening 3 years. The timetable between E-G certainly hasn't, save for minor tweeks.
So with 22 diagrams to cover, plus spare sets, 20x 4 car
EMU▸ sets will not cover all diagrams for like by like (albeit 4 car EMU replacing 3 carDMU) replacement of Class 170s post EGIP. Unless Abellio ScotRail plan to reduce the use of doubled up sets at peak times. That's very unlikely I think when all the bumpf has been suggesting an increase in capacity.
Abellio ScotRail Ltd placed a tender for
up to 400 EMU vehicles. 70-80 4 car trains (240-320 vehicles) is certainly within that
'up to' range.
Maybe, but this, from the Abellio website:-
Brand new trains operating between Edinburgh and Glasgow as part of the EGIP project
Eighty new trains due to arrive at start of December 2017
I don't see those statements to mean there are 80 new trains for EGIP. It's 80 new trains across the network. Some of which will be operating EGIP. Nowhere has there been mention of 80 new
vehicles for EGIP. Sorry, but I have to agree with Network SouthEast on this one.