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Q: How do you set up sight rails in road construction?
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What is a large car on rails for carrying people along streets?

It is a tram (UK) or a streetcar (USA). They run on metal rails set level into the road surface, and they run on electricity from overhead cables.


How are drains set out using travellers boning rod and sight rails?

Boning Rods and site rails are traditionally made from timber, but there are reusable plastic ones on the market (called Cross-Bones). They are positioned on construction sites by the site engineer.The site rails are positioned usually at the manhole point and the boning rod is used as a mobile indicator of the amount of excavation required to reach the pipe soffit. The rails are set at a uniform height above the manhole invert (say 3m) and the boning rod is made to the same depth. The pipe layer then uses the rails to eye in the boning rod to guide the machine driver so he doesn't excavate too deep or too shallow along the length of the pipe run.


What is the foundation for the rails and ties of a railroad?

The ballast is set in a graded bed. The graded soil must be level to set the rails and ties. Gravel, or ballast, is laid between the ties and rails, and tamped down.


Why are there a second set of rails inside of the main rails when tracks cross a trestle and what is this called?

The inside rails inside of the main rails are called guard rails. They are there so that if there is a derailment the train will stay within the rails instead of off of the trestle.


What is a railroad?

In the United States we call them Railroads, in other countries they may be called Railways. I am talking about a set of two steel rails the are supported by wooden or concrete ties that the rails are anchored to. The ties are there to support the rails, help spread the weight of the locomotives and cars over more surface area, and to keep the rails at a set distance apart. This allows the locomotive and cars, also called a train, to travel on top of the rails safely and quickly. In essence a railroad is a road of steel rails, that allows heavy loads to be hauled from one location to another. There is a whole network of these roads all across most every country on earth.


On some sections of railroadtrack there is a second set of rails inside the rails the train actually runs on These may be found on a bridge or in a station What is the purpose of these rails?

The inside set of rails is to help a keep a set of wheels (or truck) that have derailed heading in a forward direction. That way instead of the cars pilling up and derailing on the bridge or in the station the cars stay upright and continue on past the location that needs to be protected.


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