This structure originally extended South from the Main Terminal, directly over the site of the Main Terminal AeroTrain station. It was demolished so excavation of the train station could begin. It would later be replaced by a similar structure.

This temporary bridge was built next to the reflecting pool walkway, replacing that walkway when the structure was removed. Glass panels allowed passengers to view the progress of train station excavation. Photo from August 2001.

TS-03 Aerial photograph shows excavation complete on West half (foreground) of Main Terminal AeroTrain station and eastern half (background) excavation in early stage. Structural elements at the track level of the station are beginning to take shape.

Good aerial view directly into the excavated area. The four-level AeroTrain station facility will rise up from this below-ground location. Photo from March 2006.

Excavation underway for the eastern half of the Main Terminal AeroTrain station. Photo from March 2006.

The Main Terminal AeroTrain station site is visible all the way down to track level, as structural elements begin to take shape. Photo from March 2006.

Passengers walking through the temporary bridge (upper right) get a good view of the depth of the Main Terminal AeroTrain station site. Photo from March 2006.

This new pedestrian bridge taking shape across the train station construction site. It connects passengers directly to the Ticketing and Bag Claim levels of the Main Terminal, and it replaces the former "Reflecting Pool" structure. Photo from March 2006.

Tunnel boxes for the AeroTrain on approach to the Main Terminal station. Cranes employed in station construction are visible on the right. The site shown here will later be covered with earth. Photo from September 2006.

The platform level of the Main Terminal Train Station begins to take shape. A pedestrian bridge within the station crosses from left to right. Photo from April 2007.

This dual-level crossover connects arriving passengers back to the Main Terminal. It stands on the former site of the "reflecting pool" and bridges across the Main Terminal Train Station. Photo from May 2007.

Good aerial showing the Main Terminal and train station construction visible direcly behind it. Mobile lounges continue their operations above the train station site. Photo from May 2007.

This cutaway diagram highlights the four distinct levels of the Dulles Main Terminal. Departures (ticketing) level in green, Arrivals (bag claim) level in purple, Security Mezzanine in red and Train Platform in blue.

The media attend a briefing about the progress of the AeroTrain system and D2 program overall. Photo from October 2008.

The media take a tour of the Main Terminal Train Station mezzanine. The security screening checkpoints will operate here when the AeroTrain opens. Photo from October 2007.

The Security Screening Mezzanine overlooks the Main Terminal Train Station platform. Airports Authority President and CEO Jim Bennett leads a media tour. Photo from October 2007.

Media tour pauses at the center of the platform level of the Main Terminal AeroTrain station. The Departures level at Dulles is visible above the red beams along the top of this photo. Photo from October 2007.

The platform level of the Main Terminal AeroTrain Station continues to take shape. The AeroTrain will travel through the glass enclosures seen on each side of the platform. Photo from January 2008.

One of two Security Screening Mezzanines inside the Main Terminal AeroTrain station. Photo from January 2008.

The Main Terminal AeroTrain Station is now completely covered while work continues above and below. Photo from May 2008.

Skylights cover the roof of the Security Mezzanine level of the Main Terminal AeroTrain station at Dulles. Photo from May 2008.

Wide view of the West Security Mezzanine of the Main Terminal AeroTrain station at Dulles. An space of equal size and design is also being built to the east. Photo from May 2008.

Interior view in a train tube within the Main Terminal AeroTrain station. The train cars will stop here with doors opening in alignment with the train tube doors. Photo from May 2008.

With the train station now covered by a roof, the Main Terminal maintains its visual prominence from an airside vantagepoint. Photo from May 2008.

View inside the train enclosure. This is where the AeroTrain stops in the Main Terminal station. Photo from October 2008.

A view outside the lanes where security screening will be installed. There are two mezzanines which will house the lanes--one at each end of the Main Terminal AeroTrain station. Photo from February 2009.

The screening lane equipment will be placed in this area. Photo from February 2009.

Overhead view of the Main Terminal AeroTrain station train platform. The trains will arrive inside the glass enclosures below. Photo from February 2009.