Rensselaer Semi-Weekly Republican, Volume 19, Number 44, Rensselaer, Jasper County, 4 February 1898 — Tunnels of the World. [ARTICLE]

Tunnels of the World.

The tunnels of the world are estimated lo number about 1,142 miles, with a total length of 514 miles. There are about 1,000 railroad tunnels, 12 subaqueous tunnels, i>o canal tunnels, and 40 conduit tunnels, with aggregate lengths of about 350 miles.