I was somewhat disappointed with Volumes 5 and 6 as they didn't have much railway content. Volume 7 is almost exclusively about the railways and the content is excellent.
This collection brings together a number of films roughly connected with the "new age" of railway travel in the UK in the 1970s and early 1980s. The first film "The North Eastern Goes Forward" is from 1962 and one of the best, although sadly the enthusiasm shown in the film was to be short-lived with the pending Beeching Axe closures and loss of freight traffic to roads.
There are also some technical films covering such topics as brake blocks (quite interesting, honest!) electrification, and the construction of the HST power cars. Watching many of the movies you get the feeling that in the 1970s, BR were trying to make the best of a bad lot - permanently strapped for cash and depised by most of their users. This is most noticeable in the film "A New Age for Railways" which compares the railway renaissance in a number of countries: whilst Japan, France, Germany, Poland and Italy were pushing on with bold new schemes involving the construction of brand new high-speed electrified routes, the best the UK could bring to the table was the diesel HST (marvellous though it was, it seemed to be a poor relation).
There's also a number of safety films aimed at children and a final interview with Sir Peter Parker with well-known railway-nut Jimmy Saville. As usual the package is excellently presented and I hope there are more volumes from this series to come.