LeBron James ‘BIG’ Commercial

A freight train leaves Miami at 7:35PM. Head full of steam. Lots of cargo, no brakes. How fast will it be going by the time it reaches Boston, New York, Philadelphia, Chicago, Oklahoma City, Los Angeles, San Antonio, Dallas, Memphis, Orlando, Atlanta, Indiana, Denver, Oakland, Salt Lake City, Minnesota, Milwaukee, Houston, Phoenix????? And what would it take to slow it down? Something really, really BIG.