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3 Cities with Great Underground Transit System Tours
On a recent visit in October, the scheduled walk was "Underground Philadelphia: Subway, Railways & Stations" ($15 for two hours), and the description's promise of "two art deco masterpieces ...
Business Insider India7y
Take a rare look inside the high-tech control centre of the London Underground - the world's oldest subway system
The London Underground is one of the most advanced subway systems in the world. The machinery is often reminiscent of that found in the control rooms of New York City's subway system — which has ...