I was always fascinated with the 4 remaining tunnels on the PA Turnpike. The oldest of them were origianlly RR tunnels that were widened and reinforced. Considering the technology and relatively primitive equipment the workers and engineers had at their disposal in the 1930’s it was amazing that those tunnels as well as the original 160 mile stretch of the Turnpike between Carlisle and Irwin was completed under budget and ahead of schedule, incredible for a gov’t project.
yea and 100 years later still paying for the turnpike