tramboy said:Mk4 stock is also tilt body profiled if you look at it carefully enough...the rest is just square (rectangular if you are being pedantic!)
AlexS said:Mk2s have square toilet windows. The doors also wraparound the rear of the coach much more obviously than Mk3s. The under coach equipment is butt naked. All stock is 100 mph. Only Mk2Fs are left in official passenger service on Rhymney trains and Manchester to Birmingham New Street services.