Until it was cut back to Washington, the B&O National Limited ran from New York (Jersey City), Philadelphia, Baltimore, and Washington, to St. LouisIt also was nothing like the original National Limited route, Amtrak's being a KC-NY train.The Amtrak version of the National Limited did not use any of the original B&O National Limited rails.
Amtrak's National Limited ran from New York, Philadelphia, with a section from Washington and Baltimore; to St. Louis, (and on to Kansas City).
Perhaps Amtrak should more properly have used the PRR "Spirit of St. Louis" name, but instead decided to use the National Limited name since it did extend to Kansas City, and for a while, had the thru Los Angeles sleeper.