During this time , the forest was intensively logged , the wood products used as tunnel supports , sleepers for tramways , lining of mining shafts , to fire mine boilers , piles for piers and docks , electric poles , heavy construction timbers and fuel wood .
The wood was used for tunnel supports , sleepers for tramways , lining of mining shafts , firewood for mine boilers , piles for piers and docks , electric poles , and heavy construction timbers .