Why Don't Trains Have Cabooses Anymore?

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I use to have a friend back in the day that was either called a Brakeman or a Switchman that use to ride the later Cabooses until they were ended. He had to know what all the whistle...I mean horns sounds were for and also had to sometimes jump off and manually pull the levers to switch a point. He said it was an easy job and they could pick and choose when a route was available. He would be in the Caboose for several days and said he slept a lot. LOL