Used as a minesweeper in WW1
Copyright unknown (no stamp)

Photograph of Mercury P S, Glasgow and South Western Railway | National Museums Liverpool

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https://www.liverpoolmuseums.org.uk/artifact/photograph-of-mercury-p-s-glasgow-and-south-western-railway

Photograph of Mercury P S, Glasgow and South Western Railway

http://content.liverpoolmuseums.org.uk/artifact/photograph-of-mercury-p-s-glasgow-and-south-western-railway