Answer: a. A self-propelled engine, powered by steam, diesel, or electricity, for pulling or, sometimes, pushing.
Explanation:
A locomotive is a motorized vehicle, moves across rails powered by some type of fuel. The first locomotives were powered by coal, and it was built in 1804. Later other types of locomotives were developed, such as those powered by fuels, such as diesel or electricity.
The locomotives have allowed the social and economic development of many countries to provide an economic means of transport that could cover long distances in a short time.
Electric locomotives are currently the most developed since they can reach higher speeds and are more ecological.
I hope this information can help you.
