OK, so past history in Collin County is after a bridge is compromised by flooding usually the railroad raises it's grade through the flood prone area or makes the bridge or trestle system a little longer. I know SP and Cotton Belt did so as on a lot of their abandoned lines their bridges show evidence of being raised and were generally higher than a Interurban Bridge next door to them (as in Allen, TX).
Kansas City Southern derailment near Collinsville, Tx
A few pictures.
http://www.kxxv.com/story/39152175/north-texas-crews-work-to-clean-up-after-train-derails-due-to-heavy-rain
First time in almost 20 years, I have seen Highway 75 closed (in Plano) due to flash flooding from heavy rains, that is a major artery into Dallas from the North for Trucking. If it is that bad for the freeway system I wonder how the railroads are faring here.
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