How would the US be changed or affected if all rail travel and shipping were eliminated?

Thinking of all the things that move by rail in the US, be it people, cars, chemicals in tanker cars, livestock, coal, containers from ships, etc. if in a fairly short time, 2 to 4 weeks all rails in the US became useless, how would that affect the US? Would ingenuity develop something that was better, would commerce bog down, would it still carry one just with greater effort, or would it collapse, etc.?