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View Diary: Sunday Train: Quiet Progress Edition One ~ Superelevation & Cant Deficiency (30 comments)

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  •  I really doubt the tracks are too close (0+ / 0-)

    that is dictated by fed standards across the country, its the curves, they are of too small a radius, causing more overhang of longer cars like the standard 85 ft passengers cars.

    See the Current "Plate" Standards, is what I think its called.

    FDR 9-23-33, "If we cannot do this one way, we will do it another way. But do it we will.

    by Roger Fox on Mon Jan 17, 2011 at 12:20:33 PM PST

    [ Parent ]

    •  No, tilt trains need more than the ... (1+ / 0-)
      Recommended by:
      BYw

      ... 14' separation centerline to centerline in place in CT. Running with the tilt locked puts the Acela in the same boat as the Amtrak NEC regionals.

      Of course, the NEC is in one of the few parts of the country were ROW tends to be already built out. In places like Ohio, there tends to be ample room in the ROW ~ the original Ohio Hub 110mph Engineering Assessment (6mb pdf) noted:

      A key engineering assumption, adopted for this Study, involved the centerline offset between an existing high density freight track and a new FRA Class 6, 110-mph track. Both NS and CSX requested that new Class 6 high-speed passenger tracks be constructed at a minimum 25-foot centerline offset from the adjacent freight track. However, in order to accommodate possible future capacity expansion, the 25-foot offset was increased to a 28-foot centerline offset. The 28-foot offset would allow a future siding with 14-foot track centers to be constructed between the new 110-mph passenger track and the adjacent freight track. Based on the field reviews the costs associated with the 28-foot offset were estimated and included under the line item "High-Speed Rail (HSR) on New Roadbed and New Embankment." This line item includes new track and ties, track ballast, sub ballast and the earthwork required to build a four-foot-high embankment

      End 2010 with Lesbian Creative Works from ALC Publishing on your Holiday list.

      by BruceMcF on Mon Jan 17, 2011 at 12:31:02 PM PST

      [ Parent ]

      •  Plate B is 15'1" high and 10' 8" wide (0+ / 0-)

        http://en.wikipedia.org/...

        What you are saying is that Plate B as a maximum is obsolete, of course it is.

        FDR 9-23-33, "If we cannot do this one way, we will do it another way. But do it we will.

        by Roger Fox on Mon Jan 17, 2011 at 01:22:58 PM PST

        [ Parent ]

        •  It depends on the tilt-train technology ... (2+ / 0-)
          Recommended by:
          Roger Fox, BYw

          ... the kind that have the passenger compartment suspended within an outer shell and tilts inside the shell would, of course, not encroach on the loading gauge. The kind that tilt the whole body of the passenger train (as shown above), have a wider loading gauge going through a curve.

          After upgrading the speed of the level crossings, this is one of the main things involved in upgrading to tilt-trains in conventional rail corridors.

          I don't think that 25' centerlines are actually functionally required ~ I think that is more to make the insurance company happy ~ but more than 14' if the curve is going to involve a substantial tilt.

          Of course, tilt mechanism makes a difference as well: the Japanese mechanism shifts the train more to the "outside" of the curve, and the common European mechanism more to the "inside".

          End 2010 with Lesbian Creative Works from ALC Publishing on your Holiday list.

          by BruceMcF on Mon Jan 17, 2011 at 01:53:51 PM PST

          [ Parent ]

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