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[quote user="HarveyK400"] Sam1, You mentioned a speed restriction for the UP tracks in the MoPac Expressway median.  Just what is the limit, at least your best estimate?  Curve restrictions would be a physical impediment as well (approximate curvature scaled from Yahoo satellite map): <UL> <LI>8-degree between Chavez & Lamar limits balance speed to 20 mph with 2 inches of curve superelevation. <LI>2-degree at Chavez & MoPac, Westover Rd, and Northland Dr at the end of the median alignment limit speed to 60 mph with a balance speed of 40 mph with 2 inches of curve superelevation. </LI></UL> I wonder how real is the risk of damage to road vehicles by a train derailment.  Highway guys just sticking it to the railroad and Amtrak?  Seems to me a semi on the other side of the barrier wall would be a greater and more likely hazard, especially going 60-70 mph. [/quote] I don't know the speed restriction.  Cars easily pass the freight trains running in the median; I have not observed the Texas Eagle in the median.  Part of the speed restriction would be due to the curve at the south end of the median where the railway turns under the northbound lane and proceeds along the river. The probability of a train derailing in the MoPac median is low.  But it is a risk with potentially dire consequences.  The risk of a truck jumping a median is not germane to the question of a train derailment. I am surprise that no-one has picked-up on my comments regarding the downside of traveling by train or other public conveyance.
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