The Khojak Tunnel (aka Sheilla Bagh Tunnel) in Killa Abdullah district near Pak-Afghan border at Chamman, is a marvel of British engineering, it was the longest tunnel in the world at that time.
The Khojak Tunnel (aka Sheilla Bagh Tunnel) is a 3.91 kilometres long railway tunnel located in Killa Abdullah district of Balochistan near Pak-Afghan border at Chamman, province of Pakistan. The Tunnel is a marvel of British engineering, it was the longest tunnel in the world at that time.