The transportation industry is benefiting from the application of new machining processes, materials and advanced technology in almost every phase of its manufacturing work today. Engineering, design and the synergy of varied disciplines from diverse industries are bringing about new options for our transportation needs—from the way we get around in our every day world, to the ways the things we depend upon in our everyday life are being brought to us.
Modern train travel and transportation dates back to the 1820's, when rail lines began to connect cities together and provide a means of moving both products and people from one place to another over steel rails laid on specially prepared road beds. Cars and coaches were attached to steam locomotives, which remained the basic power source for the next 100 years. Today trains provide high load capacities, energy efficiency, and transport at faster speeds than ever. Trains are not limited to just wide open spaces, when a rail vehicle runs for at least part of the time on city streets, it's called a tram. When improved methods of underground boring were developed, making it possible to bore tunnels at considerable depths beneath power, water and sewer system infrastructure, tube trains made the process of "cut and cover" construction for underground trains irrelevant.
"Reefer" technology for refrigerated semi-trailers, trailers, vans, and ocean going containers makes a big impact on everyday life, making it possible to have and enjoy fresh produce almost any time of the year from anywhere in the world. The type of technology for refrigeration varies depending upon the particular situation, from water cooling, to cryogenic cooling, which utilizes dry ice, to high tech, high performance refrigeration units powered by the truck's diesel engine. The majority of long haul refrigerated transportation today is done by semi-trailers.