Picture of the Khojak Tunnel which was built to cross the Khojak Pass on the Quetta-Chaman railway in Balochistan. This was a strategic line built with the aim of taking this railway ultimately to Kandahar and hence was built to accommodate a double line even in 1891. At 3.92 Km, the Khojak Tunnel is still the longest railway tunnel in Pakistan. (Hal Richard Hughes)