The transit center includes three light rail tracks and platforms, with bus stops located on the east side of the station.
The easternmost track is used by inbound (westbound) Blue and Green Line trains.
Trains on this track open up doors to both the side and center platforms.
 The middle track is to the west of the center platform and is used by inbound Red Line trains.
The westernmost track has a side platform and is used by all outbound (eastbound) trains.

Inbound Red Line trains use the center track but inbound Blue and Green Line trains use the inbound main line track because of the way the Red Line junction is configured.
Because the tracks going into Gateway eastbound approach from the north, running the Red Line north to the airport from Gateway would have required the operator to change cabs.
To rectify the problem, TriMet created a special configuration to the Red Line junction.
Inbound, the double track line becomes a single track route about 1/2 mile north of Gateway.
The track runs adjacent to I-205, crosses under the main line, then swings around north on a tight horseshoe turn, and merges with the outbound track just south of Gateway.
Inbound trains then use the center track switches to cross over to the inbound track.
Future construction is proposed to reconfigure the junction and build separate platforms so that Red Line trains can travel straight north from Gateway without traveling through the loop.

In comparison, the Green Line's junction with the Blue Line, 1/2 mile south of Gateway, is configured as a standard diverging junction.

Parking at this station and transit center was originally entirely in the form of surface lots, but in June 2006 TriMet opened a new 690-space parking garage.
This compensated for the closure of the surface lot closest to the station, which was replaced by a medical building.
A surface lot to the south of the station, in place since the station's opening in 1986, was not affected.
The transit center includes three light rail tracks and platforms, with bus stops located on the east side of the station. The easternmost track is used by inbound (westbound) Blue and Green Line trains. Trains on this track open up doors to both the side and center platforms.  The middle track is to the west of the center platform and is used by inbound Red Line trains. The westernmost track has a side platform and is used by all outbound (eastbound) trains.
Inbound Red Line trains use the center track but inbound Blue and Green Line trains use the inbound main line track because of the way the Red Line junction is configured. Because the tracks going into Gateway eastbound approach from the north, running the Red Line north to the airport from Gateway would have required the operator to change cabs. To rectify the problem, TriMet created a special configuration to the Red Line junction. Inbound, the double track line becomes a single track route about 1/2 mile north of Gateway. The track runs adjacent to I-205, crosses under the main line, then swings around north on a tight horseshoe turn, and merges with the outbound track just south of Gateway. Inbound trains then use the center track switches to cross over to the inbound track. Future construction is proposed to reconfigure the junction and build separate platforms so that Red Line trains can travel straight north from Gateway without traveling through the loop.
In comparison, the Green Line's junction with the Blue Line, 1/2 mile south of Gateway, is configured as a standard diverging junction.
Parking at this station and transit center was originally entirely in the form of surface lots, but in June 2006 TriMet opened a new 690-space parking garage. This compensated for the closure of the surface lot closest to the station, which was replaced by a medical building. A surface lot to the south of the station, in place since the station's opening in 1986, was not affected.
Gateway/Northeast 99th Avenue Transit Center