Marijuana withdrawal can be more intense than people sometimes realize. While heavy, chronic users may begin to exhibit signs of depression, many users experience insomnia, anxiousness, and irritability.
A New Era. Although diesel locomotives first came to American railroads in the 1920s, their use was confined to switch engines, and later to passenger train locomotives. It wasn't until 1940 that the Electro Motive Division of General Motors (EMD) demonstrated that diesels could practically replace steam locomotives in heavy-duty service.
While the diesel engine is the prime mover the energy it creates drives an electrical generator, which in turn drives the traction motors found within the locomotiveâs trucks that actually turns the wheels (or the mounts which sit over the axles) and propels unit forward.