[Seabrook]

Superficially they looked alike but I will stand to be corrected. I think it was down to the set up of the brakes. I'm trying to recall and I think the difference was the 312 had disc brakes mounted on the wheels and the 310 had a Brake Disc arrangement mounted on the axle. I can only judge from a Drivers point of view on converting to 310s on their transfer to the Eastern Region. The 310 was I'm sure good in their day but the 312 was improving on the design with the benefits of service and time. The 312 had a hydraulic parking brake which was a modern development for instance.