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Goodreads asked Andrew Neil Gray:

Where did you get the idea for your most recent book?

Andrew Neil Gray From this fascinating BBC article about Ghost Trains in the UK. http://www.bbc.com/future/story/20150...

Rail companies run empty trains on certain lines to keep the right to offer service, and sometimes intrepid travellers get tickets. JS Herbison read it first and we both agreed it would be an interesting subject if instead of trains, it was a spaceship, empty but still running a lonely journey between Earth and Mars.

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