Hannibal Hamlin, the Vice President-elect, had separated himself from the Lincoln Train of Death. (Background: “Big Party in Philadelphia”, Ersjdamoo’s Blog entry of June 15, 2014.) Traveling secretly on a separate train, Hamlin and his wife lay in sleeping berths on their way into Baltimore. There, a mob of rough characters filled the train station. Some of these hostile persons invaded the sleeping car and even pushed open the curtain of Hamlin’s compartment. Author Michael J. Kline speculates Hannibal Hamlin may have been wearing a disguise, because the ruffians failed to recognize the Vice President-elect. 
A similar assassination plan awaited Abraham Lincoln for when he reached Baltimore. The plan was for a crowd of toughs to surround the Lincoln procession as it moved between train stations in Baltimore. The crowd would pretend to be cheering for Old Abe. But then, at the right moment, a dagger would be thrust into his heart.  This Baltimore plan is like a scene in the play, “Julius Caesar”:
CINNA: O Caesar, [stabbing]
JULIUS CAESAR: Hence! wilt thou lift up Olympus?
DECIUS BRUTUS: Great Caesar, [stabbing]
JULIUS CAESAR: Doth not Brutus bootless kneel?
CASCA: Speak, hands, for me! [stabbing]
JULIUS CAESAR: Et tu, Brute?
At 10:15, on the night of February 21, 1861, at the Continental Hotel in Philadelphia, Allan Pinkerton at last was able to meet privately with Abraham Lincoln. The small group included also Norman Judd, Henry Sanford, and possibly John Nicolay, Lincoln’s secretary. The President-elect considered what Allan Pinkerton had to say, but insisted he must go first to Harrisburg, Pennsylvania as already scheduled. 
Allan Pinkerton devised a counter-plan, to frustrate the scheme of the Baltimore Plot. Lincoln would hurry away unseen from Harrisburg, return to Philadelphia, and then take a room in a sleeping car bound for Baltimore. There would be no need for Lincoln to exit the sleeping car in Baltimore, since the entire car would be drawn by horses to the next depot. 
Again, one of Pinkerton’s best detectives, Kate Warne, was called upon for a key assignment. (Background: “Warning From Warne”, Ersjdamoo’s Blog entry of June 22, 2014.) Warne’s job was to reserve the berths on the sleeping car and travel with Lincoln. Also protecting Lincoln would be Ward Hill Lamon, a friend of Abe’s and a tough hombre to mess with. 
In Harrisburg on the evening of February 22, 1861, at the Jones House hotel, Abraham Lincoln went to his room and donned his famous disguise — except, according to Kline, it was not a Scotch cap and cloak. Instead, Lincoln wore “a bobtail overcoat,” a shawl, and a Kossuth hat. Recall from the previous Ersjdamoo’s Blog entry, “Warning From Warne”, how two competing “mad hatters” in New York City had vied to present the best hat to Old Abe. One of these hats had been a Kossuth hat, a soft wool or felt hat which could be drawn down over one’s face. Recalling his choice of hats, Abe Lincoln reminisced that “some friend had given me a new beaver hat in a box, and in it had placed a soft wool hat.” 
So Abraham Lincoln went “down the rabbit hole” in Harrisburg, Pennsylvania. One of the “mad hatters” had assisted his disguise. As for the “Scotch cap and cloak,” it too played a role. Allan Pinkerton had been born in Scotland. He “capped” (headed) a group of detectives. So Allan Pinkerton was the “Scotch cap.” As for the “cloak,” that was, of course, the Pinkerton detectives.
(The above first appeared at my Melchizedek Communique web site on May 23, 2011.)
——- Sources ——-
 Kline, Michael J. The Baltimore Plot. Yardley, PA: Westholme Publishing, LLC, 2008