Difficulties experienced by Pennsylvania Railroad in lowering floor of 3800-ft Virginia Avenue Tunnel at Washington, DC, from 236 to 54 in. to provide enlarged clearances required by electrification.
Lowering tunnel floor under traffic
Ry Eng Maintenance
Railway Engineering and Maintenance ; 32 , n 6
1936
5 pages
Article (Journal)
English
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Engineering Index Backfile | 1959