"polygonum" wrote in message
news
Might not the number of people involved have some relation to the volume
to be extracted? Sort of one person to drive one lorry carry one
lorryload, or two people to drive out twice as much? Obviously not a
perfect scaling - indeed lorry sizes might vary - but it is likely to be
soothing like that.

Bigger tunnel allows bigger lorries/conveyors in the tunnel so no extra crew
needed.
Dumping the spoils depends on where and how, a train would still have the
same number of crew, lorries may need more.


Trying to recoup extra costs by providing extra facilities is fine on
overall project costs -but you were going on about costs of boring.

Well I suppose you could try and win by doing half a job.