505 A study of the Westinghouse-type Tight Lock Coupler
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This paper describes the Westinghouse-type tight lock coupler. In Japan, this type of coupler was adopted and actually used for many years until '70s by only 1 railway company, i.e. Keihin Electric Express Railway Co., but in the U.S., still in use, for example, at New York Metropolitan Subway. This type of coupler is very compact in size, and very convenient because can connect electric circuits and pneumatic tubes at a same time. But, selecting the type of coupler, circumstances of the line that the car belongs must be considered, and especially, possibility of the case the car runs into connecting lines of the other companies. For this reason, I regret to say that the possibility of this type of coupler being adopted again by any company in Japan would be very small.
