Plane Train Tunnel West Extension


Hartsfield-Jackson Atlanta International Airport

Completion Date



Delve Underground


Atlanta, Georgia

Delivery Method

Progressive Design-Build



Contract Value

$241 million
Completed Plane Train Tunnel Extension
tunnel interior where two tunnels merge into one

This project enhances the Hartsfield-Jackson Atlanta International Airport automated passenger movement train system to increase capacity by 2,000 additional passengers per hour. Work involves excavating 250 linear feet of twin, 24-ft nominal diameter tunnels and a 50-foot by 50-foot bifurcation (chamber) where the tunnels intersect and transition to a single, 700-foot-long, 24-foot diameter tunnel excavated by SEM and drill and blast techniques. The tunnel and shaft scope includes a waterproofing membrane and cast-in-place final lining and is outfitted with cast-in-place cantilevered walkways and parallel running beams for the APM contractors’ use. Construction was sequenced and coordinated to allow full operation of the airport.


2024 Underground Construction Association (UCA) Project of the Year
2022 American Shotcrete Association (ASA) Outstanding Shotcrete Project of the Year (Underground)
2021 City of Atlanta General Contractor Safety Award