A bus is a large road vehicle designed to carry numerous passengers in addition to the driver and sometimes a conductor. The name is a neologic version of the Latin omnibus, which means "transport for everyone."
Most trains are powered by diesel engines or by electricity supplied by trackside systems. Historically the steam engine was the dominant form of locomotive power through the mid-20th century, but other sources of power (such as horses, rope, wire, gravity, pneumatics, or gas turbines) are possible.
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