Rail transport is also known as train transport.Rail transport is an enabler of economic progress, used to mobilise goods as well as people. Adaptations include passenger railways, underground (or over ground) urban metro railways and goods carriages. Rail transport has some constraints and limitations also. One of the biggest constraints of rail transport is heavy cost. Trains need high capital to build and maintain and the cost is magnified when a whole rail network is to be built. The cost of construction, maintenance and overhead expenses are very high compared to other modes of transport. Also, rail transport cannot provide door-to-door service as it is tied to a particular track. Intermediate loading or unloading involves greater cost, more wear and tear and wastage of time