While the good majority of service on Metro-North is operated by Electric Multiple Unit cars, the railroad’s dashing diesels handle the rest of the load – largely in the unelectrified territories of the Upper Hudson Line, Upper Harlem Line, and the Danbury and Waterbury Branches. West of Hudson service, operated by New Jersey Transit, is also dieselized, carrying passengers through New Jersey and into New York’s Orange and Rockland counties. Arguably, it is this diesel territory that is likely considered Metro-North’s most beautiful. Spots like Port Jervis’s Moodna Viaduct, views of the Hudson Line from the Bear Mountain Bridge, and...