Immigration and customs were really fast and painless. Use the e-gate and then stop off to get a stamp in your passport and off you go.
Top tip #1. If you want the train station do not walk into the arrivals hall once to come through the automatic doors. Instead, clear the barrier and look left, the train station entrance is right there. If you do go further into the hall there is no signage to show you missed it.
Top tip #2 Whist on the train just enjoy the view. There are so many high rock and concrete walls and so many tunnels that Internet is effectively useless.