How to travel fr Beijing to Changbaishan by train? Bringing 2 teenagers along.

Take a bullet train to Dunhua from Beijing Railway Station. The train departs at 07:13, and the trip takes about 8.5 hours. A second class seat costs CNY 333.5; a first class seat costs CNY 433.5. Then, take a bus to Erdaobaihe Town. Upon arrival, take a taxi to the mountain for about CNY 30.

You may go to see the waterfall, Underground Forest, Heavenly Lake, and Hot Springs. :)