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Alaska RR Anchorage to Fairbanks

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    Alaska RR Anchorage to Fairbanks

    This is an interestinig project and probably the most difficult track laying effort I have seen. I copyed Anchorage, north of a point just south of the wye to the airport, to start the route which is mile 120 more or less. I am now at mile 234, a few miles north of Talkeetna. This route is being done at the request of a few others and I have no real interest in this line but it is interesting anyway. It has some of the crookedest stretches I have seen, and some of the longest tangents. You can use a 500r quarter degree, or a 6000r half degree piece at the end of a curve and it is almost invisible when running a route but when the following tangent is 5 miles long or more, it is difficult to get it exactly on the correct headiing.

    Most of the line is operated under track warrants with the first 20 miles or so out of Anchorage being TCS and likewise the last 10 miles or so into Fairbanks. Otherwise all siding turnouts are either #10 or #15 manuals, mostly #10. When comparing the 2010 track chart (which I will include in the documents) with Google Earth, a number of sidings, and wye's no longer exist. And there is not much on line business either. Talkeetna, and Nenana are the only major towns along the line. Healy is fairly large, but mostly out of sight of the railroad. There is passenger service and some trains will stop on flag at certain points just to pick up somebody whose home is "not on the grid" and take them to town, which may be 100 miles along the line. The Smithsonian Channel or Nat. Geographic Channel, I forget which, had a nice series on the Alaska RR and I watched most episodes of it and was glad I did my railroad thing in the south east part of the lower 48.

    I'll add to this as I progress. My intent is to include the major bridges. There are dozens of small concrete bridges which have ballasted decks, but where I can tell that the bridge is not a ballasted deck, I am including a strech of bridge rails. There are also dozens of pipes under the track, some of which are planely visible. Then there is Hurricane Gulch. I use TSM and will create it and the other truss types but if one of you wants redo a bridge it is fine with me. I take my length measurement off what it says on the track chart.

    Jerry Sullivan, P.E. (retired from CSX & Southern, retired docent C&TSRR)

    #2
    There is definitely a scale factor issue as one goes this far north as well as some aberration between Google Earth coordinates and MSTS/TSRE coordinates. For example, at mile 347.4 just south of Denali Park, there is a large viaduct over Riley Creek which measures about 175 meters on Google Earth and if you take the dimensions of the several girder spans listed on the track chart, the total is 570 feet or 174 meters. But when you follow accurate digitizing and put the markers on the route terrain, the length comes out barely 100 meters. Not only that, but to get 175 meters in TSRE would require extending the viaduct 70 meters or so into the 9.73 degree curve leading onto the south end. But then when you transfer the digitized data, this curve can only be reasonably fitted in TSRE, using 90 meter radius pieces which are equivalent to a 19.4 degree curve. Now while this is not correct for the particular location, curves that sharp are (or were) encountered by passenger trains - where - the Old Fort Loops. Helene took quite a whack at this stretch so I don't know if it will be rebuilt or not, but there were at least two cuves this sharp at Coleman. What I am going to do, is lay track, not sharper than 90 meter radius and then if anyone wants to do things different, the in&out tangents will be correct and dynamic track can be used to place the exact curve if possible. Eric did mention that there are coordinate errors to be encountered this far north. He is CORRECT.

    Jerry

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      #3
      This sounds very interesting, seems like I might have to rebuild my runaway train movie engines to their original Alaska shape.. I pretty much modelled 1801 and 1810 exactly as they were just with fake noses

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        #4
        Does the route require some special track packs? I see some missing track pieces in the only track en landscape version online.

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          #5
          Originally posted by railrunner112 View Post
          Does the route require some special track packs? I see some missing track pieces in the only track en landscape version online.
          Yes - MTracks is used along with XTracks. We have new replacements for both here in the library as file IDs 88570 (Atracks) and 88502 (Mtracks) or you can search for the legacy versions.
          If you like what you see here at Trainsim.com, be it the discussions and knowledge in the forums, items saved in our library or the ongoing development of our TSRE Fork, I hope you'll consider a paid membership to help support keeping the site operating.... Thanks!

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