There's a stretch of disused railway near here which is still clearly visible in aerial photos over 170 years after it was closed... (https://en.m.wikipedia.org/wiki/Newmarket_and_Chesterford_Ra... -- the line from Six Mile Bottom to Chesterford closed in 1851. This is about where it diverged from the still-existent Cambridge-Newmarket line: https://maps.app.goo.gl/qXRZ84sd97A5gK4Q8 -- if you turn on the satellite-image view it's easy to see curving off to the south.)