- Air Force Intelligence, Surveillance and Reconnaissance Agency (ISRA)
- Air Force Research Laboratory
- Alaska Aerospace Corporation
- Alliant Tech Systems, Inc. (ATK)
- Alstom
- Amtrak
- Army Research Laboratory
- BAE Systems
- Barco
- BBNT Solutions LLC
- Beijing JiBaoTong Technical
Development LTD
- Beijing Metro
- Boeing
- Booz Allen Hamilton, Inc.
- Burlington Northern Santa Fe
- Calspan
- Caltrains
- Canadian National
- Canadian Pacific Railway
- China National Machinery & Equipment
- Chinese Ministry of Railways
- Crane Aerospace
- CSX Transportation
- DARPA
- Data Transformation Corporation
- Defense Threat Reduction Agency
- DeltaRail Group Limited
- Department of Defense
- Department of Energy
- Department of State
- Department of the Air Force
- Department of the Army
- Department of Transportation
- Doron Precision Systems, Inc.
- DRS Technologies
- Fast Search & Transfer
- Federal Aviation Administration
- Federal Highway Administration
- Federal Railroad Administration
- GE Aviation
- GE Power Systems
- Goodrich
- Hamilton Sundstrand
- Hankins and Anderson Consulting Engineers
- Harsco Track Technologies
- Honeywell
- Hyundai Rotem
- IBM Corporation
- Import & Export Corp.
- India Railway
- ITT Industries
- Johns Hopkins University (PACER Center of Excellence)
- Kaman
- Kansas City Southern
- Kennedy Space Center
- Kollsman
- L-3 Communications
- Lockheed Martin
- Lycoming
- Maryland Area Regional Commuter (MARC)
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- Maryland Rail Commuter Service
- Massachusetts Bay Transportation Authority (MBTA)
- Metro North
- Metrolink
- Metropolitan Atlanta Rapid Transit Authority (MARTA)
- MetroRio
- MIT Lincoln Labs
- Moog
- Motorola
- NASA
- New Jersey Transit
- Norfolk Southern
- North County Transit District
- Northrup Grumman
- Pentagon Force Protection Agency
- Plasser American Corp.
- Port Authority Trans-Hudson (PATH)
- Pratt & Whitney
- PT Industri Kerata Api
- QinetiQ-NA
- Quebec North Shore & Labrador Railway Col. (QNS&L)
- Raytheon
- Rockwell Collins
- Rolls-Royce
- San Francisco MTA
- Sandel
- Sandia Corporation
- Science Applications International Corporation (SAIC)
- Sikorsky
- Singapore Technologies Pte Ltd
- Smiths Detection
- Southern Methodist University
- Space Florida
- Steel Dynamics
- Superior Design International of Florida
- SuperVia
- Syneren Technologies Corporation
- Textron
- Toronto Transit
- TransitAmerica Services, Inc.
- TRX
- U.S. Army Corps of Engineers
- U.S. Army Missile Command
- U.S. Army TACOM-ARDEC
- U.S. Coast Guard C2CEN Engineering Center
- U.S. Navy
- Union Pacific
- Unison Industries
- United Airlines
- United Defense
- United Methodist Homes
- United Technologies Corporation
- Universal Instruments Corporation
- University of California Riverside
- Vale
- Verticalnet
- Washington Metropolitan Area Transit Authority (WMATA)
- Watco Companies, LLC
- Williams International
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