Proposed Providence Subway Map - 1914
Imagine Providence now if this was built...
Around the time that the East Side Streetcar (now Bus) Tunnel opened was a plan to expand it into a larger streetcar subway system in Providence running west to Olneyville, east to Red Bridge/Seekonk River, north to the North Burial Ground on North Main and south to Broad and Elmwood. The four subway branch lines would consolidate onto a single main trunk line between Dorrance and Benefit Street, streetcar lines would run in the subway tunnels in the core then emerge outside downtown to finish their routes on the surface. The proposal went nowhere in 1914, it reemerged in the 1920s but again when nowhere, then because automania had taken over and the focus was on building new wide streets.
From 'Engineering News' March 19, 1914 (available on Google Books: search "Providence Subway Olneyville")