Underpass at Unionville

This diligent engineer has been working hard on the problems with progress at the famous Unionville underpass. You may recall this scintillating research on the purpose of the constructions.
And how long really does it take to dig a big hole ? Your humble servant has it all worked out. Next time we need a big hole, all we need to do is get one of these.



Apparently it doesn't move that fast (1/3 mile per hour) but even at that rate we'd have the hole dug in a day. Fling a few tracks down and away we go.

I guess it would look a bit like this crossing the road there at Unionville.