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GregNH ago

It was very common back then to build steam tunnels for heating. There are two plants referenced in this article Central Heating Plant which heated 71 public buildings. There is another reference to the GW Masonic Temple in Alexandria that was heated by a plant by tunnel that was on Duke St. This was just a quick search but I am sure these tunnels were probably utility tunnels. So searching "steam" or "utility" tunnels yields more results. I also came across this Notes From The Underground where a Georgetown student explored the heating tunnels and in his notes claimed to have mapped them but I am done for today....