Revenue service
Revenue service in the tunnels officially began on August 15, 1906, with a 16-minute run. By that time, of track were in place, with connections to four railroads and 40 on-line customers. A total of 67 locomotives and 400 freight cars were on hand. In fact, coal delivery by subway began on October 13, 1905, when several carloads of coal were delivered from the Chicago and Alton Railroad coal chutes.