Note 9 — VOLUME VI slice I Châtelet to Chicago (continued 11)
Reading edition
The cut was almost entirely through firm clay. It was estimated (1905) that the total freight handled weekly in the business district was nearly 500,000 tons, and the subway was designed to handle this amount when completed. The tunnels are 12.75 x 14 and 7.5 x 6 ft., all concrete. The cars are drawn by trolley wire locomotives on a track of 2 ft. gauge.