What is quantity quota?

When did Heads of Ayr railway station end? What are the 2 first railroads? What were types of transportation in 1940? How long is train ride from Florence to Levanto? When did Union Pacific Railway end? How long does it take to get from union station to Chicago by train? What can you do at a train station? How many states does the route for Amtrak trains go through? What words describe the sounds of a bus? How much does a bus ticket cost to Tennessee from New York? What are steam locomotives fueled by? Is there a train service between Detroit and Chicago? When you are a passenger in a car is it considered safest for the seats to face in the direction of travel - rather than sideways or backwards? Where was the first train built? Do Greyhound buses go to Corcoran CA? What is the ticker symbol for Union Pacific? Are there trains that go from Philadelphia to Nashville? What are some RIT approved Charter bus companies? Does a traffic light turn green at the same time as the other turning red? Why did London Underground give the East London Line to London Overground?