 Originally Posted by Supernova
Ok, I'll bite. Tell me about trains.
Good topic!
The essential idea behind a train is to transport a large amount of material at once. This cuts costs in many areas because energy consumption is reduced. Before there were trains on rails, people would make wagon trains also known as caravans. Traveling in these trains had several advantages. There was increased protection, help in case of injury or mechanical failure, and the payload could be redistributed if needed.
In the 18th century in Europe, the industrial revolution was getting underway. People began using rails and horse drawn cars to transport goods short distances. At the tail end of the 18th century the steam engine was developed. It was then fitted onto a carriage to be used in the Scottish mining industry.
"On 21 February 1804 the world's first railway journey took place as Trevithick's unnamed steam locomotive hauled a train along the tramway of the Penydarren ironworks, near Merthyr Tydfil in South Wales."
In contrast to the independent steam engine, this used a railway system in conjunction with the steam power.
By the mid 19th century, rail transport had become the ideal means by which to move about goods. In just 60 years from the locomotives invention, Britain had constructed over 10,000 miles of railway. In the USA, the story was the same just with longer distance. By 1890, the USA had built over 160,000 miles of railway.
As time progressed, so did the rail transportation industry. Despite some initial setbacks mostly in construction costs, and logistical troubles, rail transport has become a leading economic driver.
"In the 1950s, the U.S. and Europe moved roughly the same percentage of freight by rail; but, by 2000, the share of U.S. rail freight was 38% while in Europe only 8% of freight traveled by rail.[3] In 1997, while U.S. trains moved 2,165 billion ton-kilometers of freight, the 15-nation European Union moved only 238 billion ton-kilometers of freight."
When I was younger, my parents wouldn't let me watch "secular movies" so I was only allowed to watch "inspirational or educational" material. So, I had my mom buy me a bunch of documentaries. Some on WWII, some on nature, and even some on trains. 
I remember one video saying that critics of trains initially thought the metals wheels would just spin on the metal tracks. That was until they realized that trains are uber beasts and the sheer force of weight keeps the wheels spinning.
It does tend to happen when the train is first starting...as seen here: Oliver Cromwell (wheel spin ) & moveing out of Bedford Midland Road Station - YouTube
New technology has replaced the old steam engine, although it dominated all of industry for the good part of a century. First, diesel engines were developed, then electrically powered locomotion was invented. After that, magnetically power trains were built. Each variation has its advantages and disadvantages, yet they continue to improve.
Some trains in Europe, Japan, and China run on maglev tracks.
"With maglev a vehicle is levitated a short distance away from a guideway using magnets to create both lift and thrust. Maglev vehicles are claimed to move more smoothly and quietly and to require less maintenance than wheeled mass transit systems.The highest recorded speed of a maglev train is 581 km/h (361 mph), achieved in Japan by Central Japan Railway Company's (JR Central) MLX01 superconducting maglev in 2003,[5] 6 km/h (3.7 mph) faster than the conventional wheel-rail speed record set by the TGV.[6]"
This seems to be the future of passenger train travel. In the USA, there are plans underway to build a trans-continental high speed railway. At 300mph, you could cross the country in a single days ride. It is somewhat slower than air travel but much, much more sensible and cost effective.
File:High-Speed Rail Corridor Designations.png - Wikipedia, the free encyclopedia
TRAINS ROCK
 Originally Posted by Universal Mind
Why does existence exist?
This is very similar to a philosophical argument made for god. It goes like this: By definition, god is perfect, then he would naturally possess all the qualities that make something perfect. Existence is a quality that must be had to be perfect. Therefore, god exists....
To exist is to say that there is a possibility of non-existence. Basically, we must define existence because if it means being aware of being, then we can easily answer the question.
On the other hand, if we are speak as if there is no possibility of non-existence, for which I think an argument can be made; then we can get somewhere.
Short Answer: Because there are two opposing forces in the universe which create all subsequent opposing forces. This separates the unity, effectively creating existence. Without another, one would not have anything with which to compare itself; therefore, one would not exist because non-existence would not be an option.
fun fun fun 
also
Ask/tell question/me about anyone really been far even as decided to use even go want to do look more like?
be yourself is all that you can do...
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