I didn't know you could buy the British Rail design manual. Thanks for the link. I've got a copy of "British Rail Designed 1948-1997"[0] which is an enjoyable coffee table book.

I'm more of a train spotter/anorak than a design afficionado which is why this interested me.

[0]: https://www.amazon.co.uk/British-Designed-1948-1997-David-La...