. The Street railway journal . r in cases where alarge part of the work is likely to be over existing d. c. far the best hold of the newcomer lies, it seems to us, in thelighter suburban and interurban lines having urban work requiring high acceleration will hardly prove agood field, so far as may be judged by current opinion of thealternating motor. A fortiori large railway work seems un-likely to be a suitable field. Most engineers not directly con-cerned with the production of these motors seem to take rathera conservative view of the situation, while expressing a
. The Street railway journal . r in cases where alarge part of the work is likely to be over existing d. c. far the best hold of the newcomer lies, it seems to us, in thelighter suburban and interurban lines having urban work requiring high acceleration will hardly prove agood field, so far as may be judged by current opinion of thealternating motor. A fortiori large railway work seems un-likely to be a suitable field. Most engineers not directly con-cerned with the production of these motors seem to take rathera conservative view of the situation, while expressing admira-tion for the ingenious solution of a most interesting few trials on hard-working commercial lines are, however,more important than anybodys opinion, and we hope they willsoon be had. 426 STREET RAILWAY JOURNAL. [Vol. XXIV. No. 13. HANDLING TRAFFIC DURING BRIDGE CONSTRUCTION INPORTLAND, OREGON The Morrison Street Bridge across the Willamette River inPortland, Ore., is being replaced by a new steel structure, and. MORRISON STREET BRIDGE, PORTLAND, SHOWING OLD DRAW AND FALSE WORKSO AS TO RAISE TRACKS ABOVE FLOOR OF NEW BRIDGE—TAKEN AUG. 28, 1904 with the traffic are by no means small. The old structure wasat an elevation of ft. above datum, while the floor of thenew bridge is to be ft. above the datum line. The firstthing done was to put in false work the entire length and raisethe floor 6 ft. above the old bridge, thus leaving just enoughroom beneath for the placing of thefloor of the new bridge. Temporarypile bents were put in to support thefloor. Most of them are about 60 , but in some cases 120-ft. pilesare necessary. The steel I-beams ofthe new bridge were used for string-ers on these pile bents. A travelerwas erected by which the old spanswere removed and the new onesplaced in position. The new bridgeis to have two 267-ft. 6-in. spans, one200-ft. span, a 384-ft. draw span and600 ft. of wooden trestle approaches,the total length being 1719 f
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
