Why does Southern's Class 377/6 and Class 377/7 look so much newer than the other Class 377s (including Southeastern's Class 377/2 and Class 377/5). As the Class 377/6/7s look identical to the Class 379 and Class 387 Electrostars used on Greater Anglia, GWR/Heathrow Express, c2c, Great Northern and Gatwick Express.