- From the late 1800's through the 1940's the rugged steam locomotives of the Ulster & Delaware, Catskill Mountain Railroad, New York Central, New York Ontario & Western and Delaware & Northern climbed their steep and winding mountain grades bound for the grand hotels and humble boarding houses of the Catskills Mountains. They returned with lumber, bluestone, dairy and agricultural products of the ...www.esrm.com/esrm/default.htm