Summer Train of Thought

"The gaunt trestle-work of the els brings twilight to miles of streets, the tunnels of the subways honeycomb rocks and rivers and skyscrapers. Their trains are the first things a good many New Yorkers observe in the morning and the last things a good many more remember at night."

From The WPA Guide to New York City (1939)

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I spotted this one on the R train.