@[email protected] This section is an actual tunnel, with vent holes to the surface to accommodate the steam locomotives that ran through it. Other sections (not visible here except as a light in at the end in the far background) are cut-and-cover, then open trench, and then grade-level.
It was quite an project; there were several contemporary civil engineering journal articles written about it.
Is it a true tunnel or lots of bridges under roads? It looks like there are a lot of gaps to the surface?
@[email protected] This section is an actual tunnel, with vent holes to the surface to accommodate the steam locomotives that ran through it. Other sections (not visible here except as a light in at the end in the far background) are cut-and-cover, then open trench, and then grade-level.
It was quite an project; there were several contemporary civil engineering journal articles written about it.