. Revised and enlarged ed. of the science of railways . clog-ging the brakeshoe or by ob-structing theapparatus addition tothis fatal ob-struction, steam is also objectionable for use onengines because of obscuring the view of theengineer when the exhaust escapes. The vacuum brake is in some sense a competi-tor of the compressed air brake referred to else-. Stephensons Locomotive Steam Brake forDriving Wheels, 1833.

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