Some of that's happened already, with average train speed up 20% to 27.4 miles per hour in the second quarter.

FORBES: Railroads

Other tornadoes -- one that went though parts of Choctaw County, Alabama, and ones than struck Stone, Lawrence and Jones counties in Mississippi -- also were EF2's, which have wind speeds (for three-second bursts) between 111 and 135 miles per hour.

CNN: Storms snarl traffic, batter Midwest and Northeast