Never got my head around this and I think I'm mixing up stories here. The Class 66 is undoubtfully a success. I'm sure I read that Brush (who provided the 3 / 3 wheel bogies) wanted £1 million per set, which is why we haven't seen any other wheel sets like it since that loco, despite them being better and cleared on more routes than the Class 67? Is this correct? If not, why haven't we seen any bogie / wheel arrangements like the 66 recently?