Does anyone know how the multiple-working system is designed? I had assumed that it was using the standard AAR connection (as the Mk3s did), with the new connector beside it on the front of the loco being for interlock and comms, but I've recently seen a picutre of the loco coupled to the set and this is clearly not the case - the AAR connector is not used and the only elecrrical connection (apart from the ETS) is the new one. Is the AAR plus additional functions routed through this? Presumably if so it must be switched somehow so that the original AAR socket can still be used for running locos in multi with other locos?
Incidentally, is there any indication of which other locos might be modified to accommodate the extra sets? Unless I've missed any, the fleet so far is:
In DB Red: 67010, 67013, 67015
In unbranded TfW livery: 67008, 67014, 67017, 67025