or 
30 
20 
-— 
“tu Rite © 1C, 900,000 
~ semaers Carried | 
1920 1921 1922 1923 1924 1925 
28.4 27.9 21.3 23.0 23.0 21.7 
Accidents per 10,000,000 Passengers Carried 
CHART 40 AccipENt FreQuUENcY Rates IN Terms or PropucrioN From 1916 TO 
1926 oF 172 ELEcTRic RAILWAY CoMPANIES. NUMBER oF EMPLOYEES, 55,781 
...2.60 per cent 
Accident frequency rate decrease . 
© 
Frequency Rate pc 
1. 000.000 000 Cubic Fee: 
Severity Rate per 
1.000.000 Cubic Fee? 
ol 
1921 
(8.7 
.924 
15.9 16.7 
Accidents per Billion Cu. Fi. 
2.50 0.99 2.50 
Days Lost per Million Cu. Ft. 
CHART 50 AccieENT FREQUENCY AND Severity Rates in TerMs oF Propucrion 
Foy 1921 To 1926 oF 7 CoMPANIES PropuciNGg Gas. NumBer oF EMPLOYEES. 
2,27 
1923 
1925 
16.4 
Accident frequency rate decrease ........eeveeevn.....17.6 per cent 
Accident severity rate decrease .... +... c.eniveee....00.3 “