I think it must the combination of the pink and the dull/brown seats (not the covers, but the seats themselves) that does it.
Won't NXEA be getting loads of new trains soon (relatively speaking) anyway?
And nor have the NXEA units.
It's only the draught screens that have been painted pink with the rest of the interior grey. If anything, it's a more sober scheme than the pre-refurb BR interiors that the Cl313's still have, with a huge expanse of BR Warning Yellow on the insides of the doors, the draught screens and all the way over the ceiling.
Class 313 Interior
Class 315 Interior
Or perhaps you just don't like pink. In which case, it's probably a good thing that FCC restrict it's use to the outside of their trains.
O L Leigh
Blimey...!! I post two pics for comparison and people are still saying the windows are different. They are identical. The ONLY difference is that the Cl315 window frames were renewed and repainted on refurb.
The seat frames are not brown. The problem is that the colour balance is so far not correct on all the photos linked to so far. Anoraksia's pic is the closest, but they are all to yellow rich.
O L Leigh