Yes, there is a metro system in the DC area. It is a network that contains over 100 miles of track. It is the second busiest subway in the United States (after New York City's subway system.) The metro system is known as The Washington Metro.
The Metro Train, or Metro Rail, is the second busiest rail system in the US. The rail lines are color coded, which makes it easier to identify the lines.
Moscow Metro is one of world's busiest metro systems, serving more than seven million passengers daily.
the busiest port in the world is
The Atlantic Ocean is the busiest sea passage in the world.
HOOGHLY PORT KOLKATA SECOND MOST BUSIEST.
dover
Fort Port, Scotland
Suez Canal
Hartsfield-Jackson International in Atlanta.
Hartsfield-Jackson Atlanta International Airport has been the world's busiest passenger airport since 1998.
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