Specially designed car established contour of all objects; principal piece of equipment on car is rigid templet, mounted directly over forward trucks, from which most of measurements are made; direct measuring device facilitates recording; adjustment of templet shape meets special conditions; operation of clearance car; clearances are measured in rock cuts; floodlights provided for tunnel and night work; clearance records carefully made and maintained; maintaining established clearances.
How the Pennsylvania knows and maintains clearances
Ry. Eng. Maintenance
Railway Engineering and Maintenance ; 24 , n 12 ; p 532-537
1928
6 pages
10 Figs.
Aufsatz (Zeitschrift)
Englisch
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