This raises another question: If Michael was in such a big hurry to leave Tahoe after the shooting ("If what I think has happened, has happened, I leave tonight..."), why did he take a train to Miami? I doubt a passenger train stopped at Tahoe in late '58--he'd have to have gone from Tahoe to maybe Reno or Vegas to catch a train. If he had to do that, why wouldn't he fly? And, on a long train trip, he'd be more vulnerable to unknown assassins than on flights. A guess: FFC wanted to set up that dramatically lit shot that introduced us to his bodyguard.
I have often wondered about this too. I always thought he went to LA which is a short flight from Tahoe, and took a train through Dallas, switched in New Orleans or Atlanta and went on to Miami. Even back then airlines had passenger lists, and you had to book flights, etc., and perhaps Michael didn't want anyone (i.e. Roth) to know in advance that he was coming to Miami.
I suspect Michael checked into a Hotel in Miami Beach, called Roth, told him he was in Miami and that he urgently needed to see him, and the next day he drove from Miami Beach to Roth's home with an inexplicable side trip to the Hialeah Race Track.