Transportation System Components An Internal Perspective

Topic 2 2004 Transportation System Components An Internal Perspective. Physical Components of Transportation Systems. Control , Communications , and Location Systems. Operations Marketing Tension.

Having 1established an overall taxonomy, we can now talk about components of transportation systems. Our presentation here is not unique, as others might present transportation components in a different, but nonetheless useful way. We begin with an internal perspective, focusing on physical components.

We start with the notion of infrastructure, which is typically the fixed part of a transportation system. Infrastructure can be broken down into three categories: guideways, terminals, and stations.

There are a number of examples of guideways that we can identify, two of which are highways and railroads. Highways are general-purpose guideways—any rubber-tired vehicle can ride on it. Railroads, on the other hand, are special-purpose guideways in the sense that only railroad cars, with the proper spacing between wheels (gauge), can use the railroad infrastructure. We can also talk about guideways we cannot physically see in the way we can see a highway or a railroad, such as air corridors and underground pipelines.

Let's continue with the next category of infrastructure—terminals. Terminals are distinct from the guideway portion of the infrastructure. There are a variety of examples: terminals for buses like the one in downtown Boston, railroad freight yards, airports, and street corner bus stops in an urban bus system. Often serving a dispatching function, terminals regulate the departure of vehicles. Also, freight and travelers can enter and leave the system at terminals. Additionally, terminals often have a storage function. Terminals may be used to store empty rail cars or school buses during the summer or simply overnight. Finally, terminals serve as 2.intermodal interchange points—places where people can change from the air mode in an airport to a taxi mode to go downtown, for example.

The next component, vehicles, is present in many, but not all, transportation systems. For example, there are no vehicles in a pipeline system. Unlike the guideway, the stations, and the terminals, which are fixed portions of the system, 3. vehicles are components that move.

There are 4.numerous vehicle types, including automobiles, trucks, railroad locomotives, and airplanes. In considering vehicles, their weight, durability, and crashworthiness are dependent upon the material out of which the vehicles are made. Often, there is an efficiency (lightweight vehicles require less energy to move) versus safety trade-off (lighter vehicles come out second best in a crash).

Consider automobiles, locomotives, and airplanes—each vehicle has its own method for propulsion. There are a number of vehicles, in various modes, that cannot move under their own power. Freight cars in the railroad industry, for example, have no power and have to be pulled by a locomotive. Containers or trailers in the trucking industry have to be pulled by a tractor unit in order to get from place to place. We talk about vehicles with propulsion and vehicles without propulsion as a way of distinguishing vehicle types.

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Transportation System Components An Internal Perspective. (2017 m. Lapkričio 08 d.). Peržiūrėta 2020 m. Rugsėjo 23 d. 15:33
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