Originally uploaded for the Guesswhere UK group.
This is the east portal of the Cadeby Tunnel near Conisbrough on the former South Yorkshire Junction Railway. The single track tunnel is 164 yards long, originally built about 1894, closed to freight in 1964.

The tunnel is lined with brick and Magnesian Limestone quarried locally. It is an easy and safe walk through, mostly dry. The trackbed in the cutting just beyond the western portal has been partly filled in with soil and ?colliery waste.