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[quote user="oltmannd"]   <blockquote> <div><img src="/TRCCS/Themes/trc/images/icon-quote.gif" /> Sam1:</div> <div>   Outside of the Northeast Corridor, which in my mind includes the line from Philadelphia to Harrisburg, as well as perhaps several other stretches of track, passenger trains in the U.S. are restricted to a top speed of 79 mph. Where outside of the NEC can passenger trains exceed 79 mph?  Also, how did the regulators come up with 79 mph?  Why not 80 mph?  Or 78 mph?   </div> </blockquote>   The places I'm aware of outside the NEC that allow >79 mph are: Some stretches of former ATSF that still have ancient inductive train stop.  Parts of the SW Chief route and LA to SD, most notably.  I think you can view BNSF employee timetables on line to see exactly where. The Amtrak-owned portion of Chicago-Detroit is good for 95 mph.  It's equipped with something called ITCS - Incremental Train Control System, which is a decentralized version of PTC. The NEC extensions  to Harrisburg and Albany/Schenectady have stretches of 110 mph using conventional PRR cab signalling. For a few years in the 1990s, the NJT Atlantic City Line had a stretch of 90 mph, but now the whole line is 80 mph max. [/quote] Thanks for your excellent response.  Here is a follow-up question.  On occasion, when it really gets hot in Texas, Amtrak will slow down.  At what ambient air temperatures are the slow downs implemented and why?
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