As a result of these modernization and rebuilding practices and using the newer stronger steel rails both in the south and also in the north by the 1870's high speed 40-60 mph travel was almost common between almost all northern and southern cities east of the Mississippi.
How fast were trains in the 1850s?
Despite fears of what traveling at superfast speeds would do to the human body, trains in the 1850s traveled at 50 mph or more and, somewhat surprisingly at the time, did not cause breathing problems or uncontrollable shaking for their passengers.