I've just been away on holiday for a week in sunny Plymouth and had to get the train there from Birmingham - about 4 hours either way. Fortunately I had a good book and my laptop with me, so I was able to occupy myself pretty well.
I actually found the journey was a good source of inspiration - I found myself on the same train as 200 members of the Navy who were all heading off for furlough. Listening to them chatting (nothing about what they'd been doing in service, just normal chatter) gave me a few ideas for scenes, and the reactions of some of the other passengers sparked a few character ideas as well. And then there was the guy who managed to get locked in the toilet...!
I only managed to write one short story during the journey, but that's better than none, and I finished my book as well as having the experience of meeting some great guys.
The book, which I highly recommend, was part of the Temeraire series by Naomi Novik. If you like dragons, swordplay or historic novels, read and enjoy!