The Great Oxendon tunnel (414m) on the closed ex-LNWR Northampton to Market Harborough railway line.

This is beneath the ventilation shaft half way through the tunnel.

The line was opened in 1859 by the LNWR and closed to passenger services in 1960 although sleeper services from St Pancras passed this way until 1973 and freight until full closure in 1981. Today the Brampton Valley Way foot/cyclepath passes through one of the 2 single line bores.