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On 30/09/2010 17:42, Steve Terry wrote:
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Is it possible to hear London Underground radio transmissions on a
regular
scanner now?

No, they now use a version of digitally encrypted Tetra

Google Tetra TFL
Steve Terry

What about National Rail?

They tend to use GSM-R
http://en.wikipedia.org/wiki/GSM-R

Steve Terry
--
"I would like to plead for my right to investigate natural phenomena
without having guns pointed at me.
I also ask for the right to be wrong without being hanged for it."
- Wilhelm Reich, November 1947