1983—Pub. L. 97–449 substituted “Secretary of Transportation” for “Interstate Commerce Commission”.

1966—Pub. L. 89–387 inserted “insofar as practicable (as determined by the Interstate Commerce Commission)” in two places and substituted “engaged in interstate or foreign commerce” for “engaged in commerce between the several States or between a State and any one of the Territories of the United States, or between a State or the Territory of Alaska and any one of the insular possessions of the United States or any foreign country”.