Clients include:
- Amtrak
- Atlanta Streetcar
- Baltimore Metropolitan Council
- Bi-State Development Agency: MetroLink Light Rail (St. Louis, MO)
- Caltrain
- Champaign-Urbana Mass Transit District
- Charlotte Area Transit System (CATS-Charlotte, NC)
- Cincinnati Streetcar
- Citrus Connection, Lakeland, Florida
- City of Quantico, VA
- DC Streetcar (Washington, DC)
- Delaware River Port Authority
- Detroit Streetcar
- Egyptian National Railways
- Georgia Emergency Management Agency
- Federal Highway Administration
- Federal Transit Administration
- Florida Department of Transportation
- Greater Cleveland Regional Transit Authority (GCRTA)
- HARTline TECO Historic Streetcar System
- Herzog, Inc. Tri-Rail Commuter Rail (Miami, FL)
- Houston Metro
- Jacksonville Transit Authority Skyway AGV Rail System
- Los Angeles MTA
- LYNX Transit System, Orlando, FL
- Mass Transportation Administration of Maryland:
-
- Commuter Rail
- Light Rail
- Metrorail
- Paratransit
- Transit Bus
- Memphis Area Transit Authority
- Metropolitan Atlanta Rapid Transit Authority (MARTA)
- National Transportation Institute at Rutgers University, New Brunswick, NJ
- New York State DOT
- New Orleans Regional Transit Authority (NO RTA) Streetcar System
- Potomac and Rappahannock Transportation Commission
- Regional Transit District of Denver, CO: Light Rail System
- Rockland County, NY (TRIPS-TOR systems)
- Southern California Regional Rail Authority: Metrolink Commuter Rail System (Los Angeles, CA)
- Southeastern Pennsylvania Transportation Authority (SEPTA-Philadelphia, PA)
- Texas DOT
- Transdev
- Transportation Cooperative Research Program (TCRP)
- Transportation Safety Institute (TSI)
- Tri-Met, Portland, OR
- USDOT
- Virginia Department of Rail and Public Transportation
- Virginia Railway Express: Commuter Rail (Washington, DC area)
- Washington, DC Metropolitan Area Council of Governments (MWCOG)
- Washington Metropolitan Area Transit Authority (WMATA)
- Westchester County, NY Bee-Line