═══════════════════════════╤══════════╤══════════╤══════════╤══════════ Track. │ 1908. │ 1890. │Increase. │Percentage │ │ │ │ of │ │ │ │increase. ───────────────────────────┼──────────┼──────────┼──────────┼────────── Single track │213,888.36│142,665.89│ 71,222.47│ 49.9 Second track │ 20,209.05│ 8,437.65│ 11,771.40│ 139.5 Third track │ 2,081.16│ 760.88│ 1,320.28│ 173.5 Fourth track │ 1,408.99│ 561.81│ 847.18│ 150.8 ───────────────────────────┼──────────┼──────────┼──────────┼────────── Total, all main tracks │237,587.56│152,426.23│ 85,161.33│ 55.9 Yard track and sidings │ 73,728.57│ 30,750.17│ 42,978.40│ 139.8 ───────────────────────────┼──────────┼──────────┼──────────┼────────── Total mileage operated │311,316.13│183,176.40│128,139.73│ 69.9 (all tracks) │ │ │ │ ═══════════════════════════╧══════════╧══════════╧══════════╧══════════ "The Interstate Commerce Commission in 1908 report that their Balance Sheet covers 'miles of road' aggregating 213,888.36 miles, whereas their statement of mileage represents all roads reporting to the Commission whether or not they furnished a Balance Sheet. "To analyze the Consolidated Balance Sheet, we have revised the statement of mileage to cover same roads as are included in the General Balance Sheet. The 'miles of road,' _i. e._, miles of first main track, are actual. The Commission's report not showing separately for each line the miles of other main tracks or yard tracks and sidings, the figures shown in the statement of mileage are _approximate_. It includes mileage of all second, third and fourth tracks. Undoubtedly, practically all of the second tracks, third tracks and fourth tracks are owned, or operated by, roads furnishing the Commission with a Balance Sheet. Mileage of Yard Tracks and Sidings is based on the proportion which the single-track mileage of roads represented in the Balance Sheet bears to the total single-track mileage of roads reporting to the Commission."