DIAGRAM SHOWING FAILURES PER 100 TRACK MILES PER YEAR BY MILLS
FOR PERIOD ENDING OCTOBER 31, 1920.

FIG 4. AVERAGE FAILURES CLASSIFIED BY MILLS FOR THE ROLLINGS FROM

1915 To 1919, INCLUSIVE

SUMMARY FROM EIGHT YEARS REPORTS SHOWING TRACK MILES, TOTAL FAILURES AND FAILURES PER 100 TRACK MILES