That definitely sounds like shin splints. It's kind of a misnomer, since it really isn't a skeletal condition, but muscular (sometimes it hurts so deeply, it feels like you have damaged the shin bone). This happens when significant strain has been put on the muscles near the shin (used to flex the ankle). I get this a lot if I overdo it running. The best thing you can do is rest them. Give it a week. I understand you probably *have* to walk to the train station, but don't run for a week or so. The muscles are telling you they need to recover from some kind of damage. Try compression, massage and heat, if they are really sore. It will speed healing and ease the pain. If none of this helps and it becomes a chronic problem, check with a physician. If it is a bigger problem at the root of it all, you should address it as soon as possible. Good luck!
Keep your body lean, your blood clean and your mind sharp. -Rollins