This is an imagined soundtrack to a character called Helward Mann from the book "Inverted World" by Chistopher Priest. This is a Sci-Fi novel (I suppose his most famous novel is "The Prestige" which was made into a film with Christian Bale and High Jackman) with the basic premise is that an an entire city and its people travel across a planet on railway tracks being pursued by a destructive gravitational field. The city's engineers must work to lay fresh track for the city, and pick up the old track as it moves along.  "Helward Mann" is the main character and one of the engineers.

The see-sawing major-minor riff that runs through it seems to (in my head) capture that relentless, bleak, journey of constantly moving forwards towards what can only be a desolate ending. 

Ian McInnes