Enlarge / A Mazda RT-24P emerges from the Catesby Tunnel. (credit: Multimatic)

A tip of the hat to the editor over at Dailysportscar this morning for reminding me of one of the cooler bits of industrial repurposing in the automotive world. It's a Victorian railway tunnel in England that saw its last train in 1966 but is now entering its second life as an advanced aerodynamics test facility and an interesting alternative to a wind tunnel.

The Catesby Tunnel can be found in Northamptonshire, but more importantly it's in the heart of what's sometimes called the UK's motorsport valley because of the concentration of Formula 1 teams—Mercedes, Aston Martin, Alpine, Williams, and Red Bull—and their suppliers. Originally built in 1897, it was part of the Great Central Line and connected London with the industrial cities of Manchester and Sheffield.

But the UK's train network was devastated in 1963 by the Beeching cuts , where 3,000 miles of railway were torn up, market towns and villages were cut off from the rail network, and the nation—like so many others—started becoming much more car-centric. Ironic, then, that the tunnel is, too, more than 50 years later, thanks to a company called Aero Research Partners.