What is a quota system and why was it implemented?

Are there any photos of the 1972 Bean Station Station Bus Accident? How do you keep from lossing your bags on greyhound bus? How much money do you pay for the TTC? How much power can the average steam train produce? How do people go all around the world? How many feet from a railroad should you be? Can the barred rail fly? What are the disadvantages of Multimodal Transportation? What is a railway signalman first class in 1950's? When was Copperhead Road created? What are the preventive measures to rail accident? How did the first cable streetcar work? What year did a runaway train accident occur in northeastern PA? Why accidents and near accidents should be reported? What is load shedding in traffic lights? When did Dauntsey railway station end? How much does it cost to get from the London underground to Manchester? What do subways travel on? What other cities have a similar form of transport like the metro in Paris what other cities have a similar form of transport? When was Cannock Mineral Railway created?