Geismar (UK) has had a presence on Northampton's Brackmills Industrial Estate for many years. They are a global organisation involved in the manufacture of railway plant equipment, see......
https://geismar.com/?lang=en As part of their operations they maintain a short section of track for testing purposes that is directly linked to their factory. The track is the only section of the former Midland Railway route between Northampton and Bedford that is actually in use but, looking at the rusty railhead, this is pretty infrequent!