Be aware that at the Main Railway Station in Beijing there seems to be an organized taxi scam. Cabs are in a usual line but you must pay the dispatcher a fee he determines upfront even when you say you want the meter used. He just stands there and smiles and no cab will move without his signal. The police are literally a few feet away so one must take it that they're in on this.After a seven hour train ride, I was too tired and had too much luggage to argue so I paid it.
Later, I found out from the hotel that I paid about 4 TIMES what the metered price would have been. Not a great welcome to China greeting. The new regime claims they're cracking down on corruption. They just have to look at the RR Station in their Capitol to see what amounts to extortion. If you can, take the Metro which is very efficient.