(13 Jun 2014, 7:55 pm)Dan wrote Arriva has less money to pay out with "MAX", as they don't have to retro fit power sockets - a fairly difficult (and expensive) job, as I understand it? That's the main difference between "MAX" and "Sapphire" anyway.
Must be the way the power is actually generated, stored or distributed I guess. I don't know a lot about it, but would be quite interested if anyone has info to share. I'd guess the fitting of the actual sockets is the easiest part of it.