In the rail transport, a train or convoy consists of an or several vehicles (carriages or wagons), called to each other and capable of if they move on a line or rail, for they transport people or load to and fro, according to a route previously planeada. The line or rail, it is usually constituted by the conventional double carris, for monocarril, or still for magnetic levitation (maglev). The convoy can be pulled by a locomotive or for an unit (carriage) solemnity also fed calls of multiple units.
The train or convoy, pulled by the machine to vapor had an enormous importance in the last two hundred years of the humanity's history. He was the most important element of the Industrial Revolution without a doubt, allowing the matters cousins' deslocação for the fast factories and efficiently and taking the products finishes to people, to distant areas and the countries where were more necessary. It went importantíssima to its contribution in the First and Second World Wars, taking men and weapons quickly where these more lack did. The convoys, to who the Indians called Horse of Iron were (Iron horse), that helped the English colonists the desbravar the American west and to build what today it is considered as the largest world potency.
The convoys that tied populations were, areas, countries and continents that until there they were completely isolated or where could delay weeks or months to do a simple communication to each other; in the agriculture, products that you/they took the risk of being in the areas where they were produced, they could begin to be dispatched for great distances, having like this very smaller risk of its degradation and encorajando, the increase of the productions.
About of the rail stations, they were born and villas and cities grew, where until there, nothing existed; the construction of the rail lines used many thousands of people, of cities, areas and even of different countries, contributing like this to approach different people and cultures.
About 400 years the Portuguese, with its discoveries, gave new worlds before to the world; this maxim cannot him, with the whole justice, to apply to the convoy and the development that this it provided us. Landing gear or aterragem train is one of the main components of the airplane.
It is the main member of the landing system in an airplane, used so much in the take off as in the aterragem, without them it is even possible to terrify, they put it demands know-how and the pilot's a lot of knowledge, otherwise, certainly the consequences will be drastic with human losses and material.
It is composed of a powerful shock or monkey tire mático, fed by the waterworks and commanded by the pilot for you stain manual or automatic.
The aterragem system can be manual or visual, more difficult or automatic with directional aid of apparels.
The main component of the landing gear or aterragem train, are the tire, that á 32 can arrive in an airplane of great load as Airbus-400 other elements they are the floodgate of the train or the two parallel doors that are open when the airplane aterrisa, the compartment of the landing gear, big enough, for besides if necessary it goes a person it to work the system manually, through a system of levers, fit on both sides of the compartment of storage of the landing gear. The access to the compartment is made by a close type of located alçapão the chair of the navigator, electric system of acionamento, oil bomb, hoses and mangotes that they drive the oil in high pressure, a storage system usually located in the back part of the airplane where it is the stabilized oil, therefore otherwise it can be very thick due the conditions of the flight altering its use characteristic, there is a manual system located in the cabine, when it is not possible acessar the levers of expulsion of the train. But that system possesses an incoveniente, it is very heavy and difficultly the crew, the pilot, more the copilot and the navigator together would get to work it.
When there is a problem in the landing gear of hydraulic order or same loss of one of the wheels other component of the system it is possible to land the alone airplane with a landing gear, called of inclined estolagem. Technique that that demands the commandant's of the flight extreme know-how and plenty of cold blood and a lot of knowledge of the apparel. The station has the name of Baron of Mauá, person that founded it on May 17, 1897. In 2004, the station was affected by a fire, being almost totally burned. Another tragedy happened at 13:00 in August 29, 2003, when a train using the extension Saint Cristóvão-Leopoldina it beat in the pilastra of the station, causing a tumbling that provoked the 20 people's death and it hurt other 38. Subway (Meter or Metropolitan in Portugal): it is a type of urban train, and one of its main differences is the fact of being typically underground and dedicated to the passengers' transport in nets of relatively tight mesh and with high integration with other means of transportation. They are generally built independent of the other types of transports.
The word is resulting of the popular abbreviation of the metropolitan word, because they are usually limited the lines its respective metropolitan areas.