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A viscous coupler located between the valve motor and pedestal drive gearing damped out undesired mechanical resonances.
en.wikipedia.org During the 1960s most cities replaced them by automatic couplers.
en.wikipedia.org It has an electro-pneumatic action, four manuals and fifty speaking stops, featuring 26 couplers.
en.wikipedia.org That percentage fell as the railroads began to replace link and pin couplers with automatic couplers.
en.wikipedia.org This becomes a problem when very tight coupling is required and couplers often use a different design.
en.wikipedia.org