prrhorseshoecurve posted:So were exactly in Lake Mahopac did the Put meet up with the Metro North Harlem line?
PRR;
I’m by no means an expert on the Old Put, but if I understand your question correctly, the answer is - it didn’t. The Put continued on to Brewster where it met up with the NYC Harlem Line. There was a branch of the Put which ran from Lake Mahopac to Goldens Bridge on the NYC Harlem Line. Both Goldens Bridge and Brewster are stops on Metro-North’s Harlem Line.
Here is a Line to a Wiki page on the Put - there is a list of the stops included in the article.