The 67 seems to be becoming more succesful abroad than it is in this country which it was originally designed for (like the 66, which GM even call the series 66, aswell a it's official JT42CWR designation). Aside from the issues relating to axle weight, a lot of this is down to the fact that unlike this country which is going for units all the way, other countries are very much still in favour of loco haulage for many passenger services. I doubt had the mail contracts been lost before they were ordered, EWS would have ordered the 67s anyway, probably opting to rebuild some 47/7s as 57s for charter, sleeper and thunderbird work.