Missouri Pacific Lines have increased daily mileage of Sperry detector car from 21-1 to 30-0, and its annual mileage from 6188 to 9074, 4211 mi of main tracks being scheduled for regular examination; table giving rail inspection statistics of Sperry detector car.
Systematic detection of rail defects in U.S.A
Ry Gaz
Railway Gazette ; 76 , n 5
1942
Aufsatz (Zeitschrift)
Englisch
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