I've just traveled on a long journey (4 hours) by train. It may be slower than plane, but it feels much more relaxed, there's a lot more space (up in first class we shared the entire carriage with about 6 other people), although the rest of the train was a lot busier, but most important of all, it lets you see a lot more of the country and the countryside, including those areas where you are just a few yards away from the craggy rocks of the coast and the North Sea.

It also gives you a much better opportunity to do some work - I had a massive table at my disposal, my own standard power socket and, had I been on the right train, the opportunity to use the free wireless (chargeable in standard) for Internet access for the entire journey duration.