Modern locomotive engineering, with questions and answers .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & co · leaf 542
ick-action triple,it is not only necessary to reduce the train-pipe pres-sure lower than that in the auxiliary, but it is abso-lutely necessary that the reduction be madG gradtia/fyto prevent the emergency action. The old-style brake valve, or three-way cock, hadonly three positions, viz:… … x^ AUTOMATIC AIR BRAKES 529 running position, lap, service application, and emer-gency.
Locomotives
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