I'm looking to go home in the other direction from Korea...meaning across Russia to Europe, then to the U.S....any ideas? I want to find a tour that does the train across Russia and then group that tours Moscow and St. Petersberg..definitely don't want to hang out in Moscow alone. Ley me know if you've done this before and if there are some good websites for this.
You can take train to China and then proceed with Russian routes. there is a train starting from Korean to Dandong, Shenyang and Harbin, then to Russia.
This website will probably tell you all you need to know:
See my blog at http://www.travelblog.org/Bloggers/TRANS-SIBERIAN-RAILWAY/