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absorption achieved acoustic air outlet airborne amplitude attenuation Big Four blade building built cabin California Central Pacific Central Pacific Railroad Charles Crocker Chinese Cirolana compressor control room crew Crocker damping dBA sound level decibels deck diesel engine Dodge duct effect engine room exposure flexible force Gould Grenville Dodge Harriman hearing loss hearing protectors Indians installation intake Judah Leland Stanford locomotive loudness low frequency machine machinery space main engine mass miles mineral wool noise and vibration noise control noise levels noise reduction noise regulations occupational deafness octave band Pacific Railroad Act Palmer practical problem propeller radiated raft rail reduce the noise regulations and recommendations result rev/min Santa Fe ship shown in Fig silencer sound insulation sound pressure level Southern Pacific speech interference speed Stanford steam Stevens Stourbridge Lion structure tion track transcontinental railroad turbocharger Union Pacific Vanderbilt velocity vibration isolators workers York