It was surprising to find the article on the Lotschberg base tunnel (NCE 7 December) made no mention of the historical context and the heroic work of earlier engineers.
The existing Lotschberg tunnel is 14.6km long and took seven years to build, opening in 1913. I remember reading that the construction was incredibly difficult, particularly due to the ingress of enormous quantities of water which led to drastic rerouting. The sinuous course of the tunnel is clearly shown on large scale maps.
AJ Ironside (M) email@example.com