Jock Valley Engineering
- Provides engineering services relating to railway infrastructure including crossings, tracks, bridges, and signals.
- http://www.jockvalley.com/

U.S. Railways, Inc.
- Freight Railroad Intra-Plant Switching Contractor.
- http://www.usrailwaysinc.com/

Great Plains Rail Line Contractors
- Track maintenance, construction, inspections and snow removal.
- http://www.greatplainsrail.com/

Sersa Group
- Flexible excavation, loading and transportation of ballast, gravel.
- http://www.sersa-group.com/

Siemens Transportation Systems
- Siemens Transportations Systems provides services for infrastructure and rolling stock. With detailed information and references worldwide.
- http://www.transportation.siemens.com/

GBM Gleisbaumechanik Brandenburg/H. GmbH
- Modernisation and construction of components for light rail vehicles, freight and passenger trains.
- http://www.gleisbaumechanik.de/

Dampflokwerk Meiningen (Germany)
- Maintenance of steam locomotives and other steam vehicles, snow ploughs and historical passenger carriages. Information and technical data about German steam locomotive classes.
- http://www.dampflokwerk.de/

Transrail Railroad Construction Company
- Railroad contractors located in Wellsville Ohio.
- http://rhometown.com/geniedsp/geniesite.cfm?section_id=S00000011707&user_id=UU0000014268

Amtrac Railroad Contractors
- Provides railroads and rail-served industries with track construction, repair, maintenance, inspection, and design. Based in Ohio.
- http://www.amtracohio.com/

Lathrop & Associates
- Historic preservation and restoration for tourist railways and railroad museums.
- http://www.irondave.com

Bridgen Enterprises Ltd
- UK provider of rail maintenance and infrastructure renewals, welding and grinding, safety critical training and track staffing.
- http://www.bridgen.com/

H&H Engineering and Construction Inc.
- Railroad engineers in the Western U.S.
- http://www.hheng.com

Cando Contracting Ltd.
- Railroad contractors.
- http://www.candoltd.com

Healey Railroad Corporation
- Provider of railroad materials and full service construction and repair of railroad track.
- http://www.railsource.com