The term 'locomotive pullers' refers to the people who operate LOCOMOTIVES, which are large, powerful machines used to pull trains. They are responsible for controlling the speed and direction of the train, as well as ensuring that it is running safely and efficiently. The job requires a high level of skill and knowledge, as well as a good understanding of the railway system. The term 'ENGINES' is often used interchangeably with 'LOCOMOTIVES', as they are both used to power trains.