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Project Experience: Railroad Capacity Improvements, Alaska

The Challenge

The Alaska Railroad Corporation (ARRC) needed noise and vibration services related to planned capacity improvements and increased passenger train service.

The Strategy

HMMH:

  • Performed noise and vibration measurements in the winter, spring and summer to determine the effects, if any, on noise and vibration by season. The analysis has shown frozen ground may not transmit the vibration as efficiently in some soil types
  • Conducted controlled measurements on passenger trains to determine the effects of speed on both noise and vibration. ARRC is investigating the potential for operating passenger trains at higher speeds, without causing higher vibration levels than those  currently generated by slower moving freight trains
  • Determined if ground-borne vibration or air-borne noise-induced vibration is the source for vibration complaints from residents living near the tracks