The firm says electric trains powered by overhead cables are cheaper to run than diesels because of lower fuel and maintenance costs.

BBC: Electrification of Swansea to London trains 'by 2018'

Compared with trucks, freight trains are fuel efficient, less labor intensive, safer, cheaper, and they don't clog up highways.

FORBES: Join The Cold Train

To exploit the power of modern high-speed locomotives, engineers resort to tilting trains and special track free of sharp bends: it's cheaper than tearing up the existing rails and starting again.

ECONOMIST: The millennium-bug muddle