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Ii. Low temperature. Preceding paragraphs have indicated most of the effects of low temperature on operations. 80 Hours of Delay Total Delays- March, 1952- 470h 11m FIG. 7. Delays to regular trains caused by weather on the Milwaukee Road by divisions, main line: Chicago, Illinois, to Tacoma, Washington, March, 1952. Amount of Delay Divisions Iowa Chicago Term•nol Springfield Ill ina is St. Louis Kentucky Memphis Vicksburg Louis ion a 10 Amount D•v•s•ons of Delay T Milwaukee • La Crosse 8 R1ver Host tngs 8 Dakota Trans- Mtssouri Rocky Mountain Idaho Coast ••• 0 5h56m 39h49m 190 Total Delays- 40h 12m {August,l951 through Jonuary,l952) FIG.

This study covering the period August 1951 through January 1952 has very few delays to regularly scheduled trains which are directly attributable to snow. The major cause of delay, general weather conditions, 8 hr 15 min, undoubtedly includes some snow storms. Recorded snow effects account for only 2 hr 15 min. Total weather delays in this six months period were only 40 hr 12 min. Much of this was attributable to low temperature rather than to snow. The foregoing are the delays that a transcontinental line in the northwestern United States would experience in a normally severe winter period.

P. Johnson, General Manager, Alaska Railroad, May 26, 1951. 0 15 20 40 0 to to -20 to -40 to -60 Earlier instructions required tonnages 10 per cent lower than this (when steam was in general use). As an actual practice, train crews frequently cut their trains in two and run with only half tonnage, especially over adverse grades. The Milwaukee Road reduces tonnages as follows: 10 per cent 0 to -10F -11 to -20F 30 per cent Below -30F dispatchers use their own judgment. Usually a 5 to 10 per cent reduction is made when strong adverse winds prevail.

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