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HMMH specializes in noise and air quality assessments for rail projects and is active in all phases of major rail projects.

HMMH is also the author of the Federal Transit Administration (FTA) Transit guidance manual and the Federal Railroad Administration (FRA) High Speed Ground Transportation guidance manual for noise and vibration. HMMH teaches a transit noise and vibration course.

Areas of expertise include:

  • Commuter rail noise
  • Freight rail noise
  • Guidance Manuals
  • High-speed ground transportation noise
  • Locomotive horn noise
  • Urban transit noise
  • Virtual Soundscapes

We have a vast array of project experience in all of the above areas of expertise.