Re: inside running rail of the curve will be accompanied by an addition guard rail


Dennis Storzek
 

On Thu, Jul 23, 2020 at 09:02 PM, Jim and Barbara van Gaasbeek wrote:
There may be other reasons why the HTC could get away with such absurd track radii without guard rails.
There was... the size of their motive power. Freight cars of this era were fine with those tight curves, and the Harlem Transfer used a boxcab diesel with trucks that were hardly any longer wheelbase. Even before the diesel the motive power was a tiny 0-4-0. But mainline railroads tended to use larger power for local switching; six couple and smaller eight couple power being common. These long rigid wheelbases had problems with tight curves. The first modification needed was to widen the gauge... as much as 1-1/2 or even two inches, and this has been done. How can I tell? The standard flangeway for guarded curves on 4'-8 1/8" gauge track is just under 2". This is so small that it is not obtainable with standard rail' the bases interfere with each other and the base of the guard rail needs to be sheared. However, when the gauge is widened the guard rail moves in tandem with the opposite running rail. The photos presented have the guard rail so far from the running rail that there is room for spikes in between.  The gauge has been widened at least 1-1/2" to accommodate steam locomotives.

Dennis Storzek

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