Yes, a good reading by Suibhne. JB's using a lot of impressionistic touches as usual rather than being literal minded.

The "mineral line" in A Shropshire Lad is beyond doubt an industrial railway, maybe narrow gauge, maybe hand worked. The term was used on some maps to distinguish industrial railways from main line ones.

Betjeman was a big railway fan although maybe not a gricer! I love the story of the "Great Northern Jolly". JB was invited by Dick Hardy, British Railways Divisional Manager, Kings Cross. W O Bentley (of Bentley cars) also came along. Apparently the two got on like a house on fire and the jolly concluded with a trip by JB in the cab of a "Deltic" from Peterborough to Kings Cross.