what does the word locomotive mean

“Historically, reducing emissions has simply meant financial penalties for industry – which creates conflict between government and business. But British Glass firmly believed that sectors which took advantage of this opportunity to influence government strategy stood to reduce costs, develop resilience on energy pricing and gain a competitive edge over businesses that didn’t become green economy leaders. Long before there was machines to sort out on and competitive sports to keep us moving and before wars were being fought, man didn't think about fitness and health as a technique of keeping healthy. He simply knew that if he didn't hunt, he wouldn't eat of course, if he didn't run, something would hunt him. They were challenging times that focused simply on survival. For a lot of people, progressing to a fitness center could be the hardest step. However, some, who did hit a fitness center, opt to give up since they see no significant result after making long and hard efforts. The problem lies in the fact hitting the gym just isn't enough. It is necessary with an effective exercise regime. Flickr: Danny O