The longest tunnel is at Barog, and is associated with local tales and legends. As per a famous story of Colonel Barog, the engineer of this tunnel, had committed suicide here. He started digging the tunnel from both ends and could not align them. So he was fined 1 rupee. He shot himself out of frustration, in the incomplete tunnel which still exists. Later it was constructed by Chief Engineer H.S. Harrington & guided by Bhalku, a local sage in 1903. This 1143.61 meter long Tunnel No. 33, is the longest of the 102 operational tunnels on the route of the Shimla-Kalka Railway. Barog tunnel is the straightest tunnel in the World.