How many carriages on Hitachi's new train(s).. that one definitely didn't look to ohave 8.. it resembled a class 180 in length
Some will have 5 coaches others will have 9.
Specifically, the
ECML▸ out of Kings Cross is expected to get a 9-car
IEP▸ for each of the current 9-coach IC125 and IC225 trains, plus 5-car IEPs to expand the fleet size. The Great Western, on the other hand, is only expected to have 18 9-car diagrams, which will be limited to the electrified routes (to Bristol and Swansea). Except that all the Swansea, Cardiff and Bristol services would require about 22 diagrams, so some workings even on those routes would be 5-car. Everywhere else on the Great Western is not planned to receive electrification and would be stuck with 5-car IEPs on all services (with one or two London-peak workings into strengthened to 10-car by running the fives in multiple). For further discussion on that, see
this topic. The only exception is services to Plymouth and Penzance, which is currently not expected to be getting IEP.
You forgot one major word re the
GW▸ ....'yet'
I'm sure that, before the current planned electrification is up & running, additional sets & wires will be announced/ordered & it will become a rolling project