I rode the connector train from the car rental place to the North terminal for the first time about a week ago.

At first I thought it would be faster than that awful bus, but the stops at each station are agonizingly long and there are a LOT of stations to stop at, many of which seem to be about 100m from the last station -- including one stop for the old, currently unused international terminal.

The train that runs clockwise just connects the terminals right now, the counter-clockwise one goes to the car rental place.