Siemens Transportation Systems  
   Rolling stock, rail safety systems, mass transit and turnkey projects.
   http://www.siemens.com/ts/

Meridian Rail Corp.  
   Manufacturers of trackwork components, wheelsets and associated rail products.
   http://www.meridianrail.com/

Harsco Track Technologies  
   Designers and manufacturers of railway infrastructure maintenance equipment.
   http://www.httuk.com/

ACIC International Ltd  
   Data acquisition systems used in the railway industry. Products, software, contacts, information.
   http://www.acic.co.uk/

Bombardier Transportation  
   Locomotive, railcar and rail related products manufacturer. Also offer leasing services in North America.
   http://www.transportation.bombardier.com/