Preliminary Worries with the Pennsylvania Railroad Tunnels
Clip: Season 26 Episode 5 | 2m 6s
When the Pennsylvania Railroad announced they would be tunneling into Manhattan, rather than building a bridge, people were stunned. Tunneling underwater was known to be dangerous, and once they were built, the tunnels would need to withstand hundreds of trains traveling through them every day. With a typical Pennsylvania Railroad passenger train weighing 700 tons, this was no small challenge.
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