Track depression is combined with elevation of street approaches. (2000 w.) (86696)
Oregon-Washington railway separates grades for three miles at Portland
Eng News-Rec
1918
Ills.
Article (Journal)
English
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Oregon-Washington railroad and navigation company's Portland bridge
Engineering Index Backfile | 1911
Portland International Airport, Portland, Oregon
NTIS | 1974
Engineering Index Backfile | 1940
Engineering Index Backfile | 1963
Engineering Index Backfile | 1932