A double-track tunnel would let trains run in both directions and make British army deployment closely resemble a railway timetable. Normal passengers and freight are readily envisaged, while railway guns and tanks raise questions about clearance. A participant suggests a larger loading gauge within the tunnel even if the approaches remain more restricted. Loading gauge concerns the space around a vehicle, while track gauge is the distance between the rails. Standard-gauge track can carry a larger vehicle where the route permits. A wider and straighter bore would require deliberate provision during construction.
Notable Point · 1:59:42-2:01:30
Tunnel dimensions constrain military rail traffic
A direct rail link carries troops and stores, but oversized equipment depends on loading gauge and the design of the approaches.