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I recommend installing OsmAnd for mobile and using the openrailwaymay layer. It's much more responsive than openrailwaymap.org and you can discover abandoned railroads while you're driving around.

Aye, plenty dotted around - some is ok, often it's crap.

There was a large coal mine below this structure, which closed in the 1980's I believe.

I crossed the nearby canal on a disused railbridge, the line which went through the tunnel shown in the album.

Where the line headed over the canal, it headed past Charles Roberts, a rail engineering company my grandfather once worked at (he also worked previously at a mine called Hartley Bank, a little further up the canal, no trace of which survives save a landing on the canal and the name of a wood over the former site).

A couple of miles from the viaduct is a pre-railway tramway viaduct, which leads to a tunnel, no more than 6'6" in height.

I made another album of the rail bridge over the canal and some other bits.