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.
Trivia.  1 Engine often refers to an actual locomotive itself, particularly diesel and steam locomotives. Yet, this should not be confused with the actual engine officially referring to the combustion-engine that powers it.  2 Traction-motor is a term used to describe an electric motor used to propel a locomotive.