Statistics for occurrence #1 of “Mr. Lincoln” in entry felton-samuel-morse of Harper's Encyclopedia of United States History:

...in 1834; connected with the Fitchburg Railroad until 1851, when he became president of the Philadelphia, Wilmington, and Baltimore Railroad. It was he who successfully planned the secret passage of Mr. Lincoln from Harrisburg to Washington, and thereby defeated a deep-laid plot to capture the President-elect. When communication through Baltimore was impossible (in April, 1861), he devised a plan for tran...
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