F Great Eastern
Established Member
Not in my experience. Any slight increase in boarding time is more than made up for by the improved acceleration and braking performance. For example, it's possible to depart Attleborough on time and then have to sit at Thetford for a minute or two waiting departure time, and the same again at Brandon, and often several minutes wait at Ely. I don't recall this ever happening with 170s.
Ony delay I have really seen on those lines on the new stock is at terminus, where it's not an issue anyway.
Be more interesting to see what happens on the Ipswich locals where there is large passenger traffic between Stowmarket and Bury of students and the Stansted Express at Tottenham Hale though.