What tunnel runs under the Hudson River and has a ventilation system innovated by Ole Knutsen Singstad?
Ole Singstad Ole Knutsen Singstad (June 29, 1882 – December 8, 1969) was a Norwegian-American civil engineer who innovated the ventilation system for the Holland Tunnel (which subsequently became commonly used in other automotive tunnels) and advanced the use of the "Sunk-tube" method of underwater vehicular tunnel building, a system of constructing the tunnels with prefabricated sections.
North Hudson County Railway The North Hudson Railway Company built and operated a streetcar system in Hudson County and southeast Bergen County, New Jersey before and after the start of the 20th century. It was founded by Hillric J. Bonn who became the first President in 1865 and served for 26 years until his death, and eventually taken over by the Public Service Railway. In its endeavors to overcome the formidable obstacle of ascending the lower Hudson Palisades, or Bergen Hill, it devised numerous innovative engineering solutions including funicular wagon lifts, an inclined elevated railway, an elevator and viaducts.