TechCrunch has a story today about using Twitter to follow weather and train service in the UK.

As snow hits the UK the Twitter mashups storm in, TechCrunch, Mike Butcher, Feb 2, 2009. “There’s nothing like a breaking news event to show off the usefulness of Twitter. Today large swathes of the UK were blanketed in snow, but the Twitter feeds and mashups came to the rescue of anyone wanting real-time updates about what was happening. “

Ben Smith runs UK Train Wiki which uses Twitter to send alerts about train delays. The homepage shows the Twitter accounts for different train routes in the UK. So, if you are flying into Heathrow and taking the Heathrow Express into London, follow @uktr_heathrowex to see if there are any delays.