. Official proceedings . Camp 54 Alaska Northern Railway. There is little or no danger of damage to the railroad along thisroute due to advancing glaciers but much trouble has been 304 experienced from the shiftin- lacial streams—the valley ofPlacer River is i)articularly troublesome for this reason. ( )n the descent into the \;dley of JMacer l\i\-er there aretwo miles of track huilt on two reverse horseshoe curves and onecom])lete loo]). ( )ne of the curves is on a four-deck trestlewhich has a length of fe^-t and of the three remainingtrestles the highest has a u-degree curve with a gra
. Official proceedings . Camp 54 Alaska Northern Railway. There is little or no danger of damage to the railroad along thisroute due to advancing glaciers but much trouble has been 304 experienced from the shiftin- lacial streams—the valley ofPlacer River is i)articularly troublesome for this reason. ( )n the descent into the \;dley of JMacer l\i\-er there aretwo miles of track huilt on two reverse horseshoe curves and onecom])lete loo]). ( )ne of the curves is on a four-deck trestlewhich has a length of fe^-t and of the three remainingtrestles the highest has a u-degree curve with a grade of ])cr cent. This grade is the steepest to be found on the 71 miles of the constructed Tunnel on Line of the AlaskaNorthern R. R. Railway Routes in Alaska, Report of Alaska Railroad Com-mission. 62nd Congress. 3d Session. Document Xo. 1346,l)age 80. 305 Seven tunnels have been driven, several of them in closeproximit}. The last six occur within a distance of 4,500 feetand have an aggregate length of 3,000 feet. The tunnels con-stitute one of the most disadvantageous features of the roadas the large quantities of water encountered freeze in wintermaking it extremely difficult to kee]) the tunnels ojien. It ispossible to overcome this trouble by choosing a slightly differentroute, but so far as I am aware the government engineers havenot indicated their intentions. On reaching Turnagain Arm the road as constructed fol-lows the east shore to Kern Creek, which is as far as the roadis built. From Kern Creek to the south shore of Knik Arm,an eastern extension of Cook inlet, the track is exposed to snow-slides and will have to be jM-otected b}- snowsheds. As the line swings to
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