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

Here is the question :

SINCE 1909, CONGRESS HAS USED WHAT UNIQUE FORM OF TRANSIT AT THE CAPITOL?

Here is the option for the question :

• Glass elevators
• Subway
• Moving walkways
• Scooters

The Answer:

And, the answer for the the question is :

Explanation:

[STC0016802]. The Metropolitan Area Transit Authority (Metro) is well-known for its public transportation system in Washington, District of Columbia (D.C.), but not everyone is aware that Congress operates its own private equivalent. One of the most efficient ways for members of Congress and their staff to get from nearby Senate and House office buildings to the Capitol is to take a private subway line. The first Studebaker cars on the route were replaced by a monorail vehicle with a wicker carriage in 1912, and that system was replaced by an automatic train in 1993.