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Re: (rshsdepot) Tunnel: 'Hidden historical asset of Baltimore'
At 09:18 PM 8/2/01 -0400, you wrote:
>While I am not sure about the 4.8% grade to the Howard St. Tunnel, Saluda
>Grade in NC has a sustained grades of 4.5% and short stretches that exceed
>5%.
>
Maybe I am going out on a limb here but,
If the area or the stiff grade is not too long and knowing the tunnel is
under a river, I would imagine there is an opposing grade toward each end
of the tunnel with the bottom of the grade at the center. Here is what I
think could be the allowance for such a steep grade. The train enters the
tunnel and heads down grade. The rest of the train follows. The leading
part of the train reaches the bottom of the grade and heads upgrade to the
other end of the tunnel. The rest of the train is still heading down grade
and this helps to push the leading end of the train upgrade. As long as the
train isn't short, the opposing grades could effectivly cancel each other out.
Just my thoughts and my limited experience with basic physics.
Bruce Mowbray
trainhead_@_mymail.emcyber.com
http://www.geocities.com/trainhead391/
TMB Manufacturing and Locomotive Works
1 1/2" Scale & 2 1/2" Scale (Narrow Gauge) Live Steamer
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