[Answer] Since 1909, Congress has used what unique form of transit at the Capitol?

Step 1 : Introduction to the question "Since 1909, Congress has used what unique form of transit at the Capitol?"

...Washington, D.C., is well known for its Metro transit system, but not everyone knows Congress has its own private version. Members of Congress and their staff use a private subway line to quickly travel from nearby Senate and House office buildings to the Capitol. In 1912, the line’s original Studebaker cars were replaced by a monorail vehicle with a wicker coach, and in 1993 that system was replaced by an automatic train.

Step 2 : Answer to the question "Since 1909, Congress has used what unique form of transit at the Capitol?"

Subway:

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