Yeh sadly the 312's were "dinosaurs" when they were built. Very similar to some of the latest (mid-70's) VEPS.I wonder if they are regretting getting rid of the 312s from GE. With CDL and TPWS and they would have been good for a few more years. Then again, Angel could have made some money off them if they had held onto a few rarther than selling the whole lot for scrap in one go. It's always amusing, but sad at the same time, to think that the GE 312s were newer than some of the Mk3s 'one' are now running, and were introduced on the GN Outer Suburban services over a year after the 313s started on the Inner Suburbans. None of them even got to 30 years old, most being nearer to 25 years old when withdrawn. Of cource, had BR specified them with sliding doors, I'm sure there would be no questions about them still running today, probably being withdrawn around the same times as the 313s and similar types.
You are thinking of the time when the entire Class 360 fleet had to be withdrawn owing to some problem (can't remember what). There were still a few 312s in service (which had TPWS) but most were at Pigs Bay and non-TPWS fitted. A solution to reinstating some units was found by putting two non-TPWS sets with a TPWS fitted unit, but reformed so that the two driving cars of the TPWS set were the outer vehicles in the 12-coach formation.Talking about 312's - wasn't there a time in 2004 when the 360 availabiltiy was so bad that they had to drag a couple of 312's from Pigs Bay and press them into service for a couple of days!? I imagine now the units left at Shoeburyness (if any?) have deteriorated too much to be brought back at such short notice (as 312 must have been fitted with TWPS, as otherwise they would have had to be withdrawn in 2003, they also must have had AFFF fire extinguishers fitted (replacing Halon) as that rule also came in during 2003) - but obviously no CDL unfortunately.