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To make transit competitive with driving, Ikhrata has floated everything from exploring a futuristic hyper-loop system to constructing an underground trolley line from San Ysidro to Kearny Mesa to building a “Grand Central” station that would connect regional transit riders to the San Diego International Airport.

The progress in developing the underground trolley station at Dupont Circle has made me curious: Were there also aboveground trolleys at Dupont Circle?

Emboldened by the project's success, a team of designers and engineers has proposed the polar opposite idea: transform a deserted underground trolley depot into a haven for leisurely recreation.

Another tunnel connected the shelter with an underground trolley line.

In some systems an underground trolley is employed.