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American Tunneler's Pictures
Amtrak Frederick-Douglass-Tunnel-with-Electrified-Trains
Potomac River Tunnel Corridor Map
Amtrak B&P Tunnel Replacement Renderings
VTA BART Phase II extension planning
BART Phase II Project Alignment Map
Robbins Single Shield TBM Lake Ontario
Robbins Single Shield Lake Ontario breakthrough
Traylor Bros TRWD IPL-19
Robbins XRE TBM in Turkey (from Robbins media relase)
Robbins XRE TBM in Turkey
cover tunnel photo by: Matt Brown from London, England / CC BY
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