div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documentaerotrain-dulles-airport-train-system-tunneling-methods-were-used-to-excavatehtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: AEROTRAIN - DULLES AIRPORT TRAIN SYSTEMtunneling methods were used to excavate these tunnels The first method called cut and cover was used to excavate approximately 7700 track loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader034fdocumentsusreader034viewer20220420185e75f54bb6a81a325c31723ehtml5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=documentaerotrain-dulles-airport-train-system-tunneling-methods-were-used-to-excavatehtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: AEROTRAIN - DULLES AIRPORT TRAIN SYSTEMtunneling methods were used to excavate these tunnels The first method called cut and cover was used to excavate approximately 7700 track loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader034fdocumentsusreader034viewer20220420185e75f54bb6a81a325c31723ehtml5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=documentaerotrain-dulles-airport-train-system-tunneling-methods-were-used-to-excavatehtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: AEROTRAIN - DULLES AIRPORT TRAIN SYSTEMtunneling methods were used to excavate these tunnels The first method called cut and cover was used to excavate approximately 7700 track loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII=...