| TSS, Inc. has supplied or is supplying to the following agencies:
- Amsted
- Alstom/Bombardier
- AMTRAK
- Brookville Equipment Corp.
- Calgary Transit
- Chicago Transit Authority (CTA)
- General Electric Transportation (GE)
- Greater Cleveland Regional Transportation Authority (RTA)
- Hyundai Rotem
- Irwin Car & Equipment
- Kawasaki Rail Car
- LA Metro (LACMTA)
- Long Island Railroad (LIRR)
- MARC Train Service
- Massachusetts Bay Transportation Authority (MBTA)
- Messiah
- Metra
- Metro North Railroad
- Metropolitan Atlanta Rapid Transit Authority (MARTA)
- Miami Dade Transit
- National Railway Equipment Company (NRE)
- New Jersey Transit (NJT)
- New York City Transit (NYCT)
- Niagara Frontier Transit Authority (NFTA)
- Nippon Sharyo
- Northern Indiana Commuter Transportation District (NICTD)
- ORX
- Penn Machine
- Plasser American
- Port Authority Transit Corporation (PATCO)
- Port Authority Trans-Hudson (PATH)
- Progress Rail
- Protrans BC
- Regional Transit District (RTD) Denver
- Ronsco, Inc.
- RTM Quebec
- R&W Machine
- San Diego Trolley
- Siemens Industry, Inc.
- SMART
- TTA
- Toronto Transit Commission (TTC)
- UTCRAS
- Washington Metropolitan Area Transit Authority (WMATA)
- Wheelworx
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