Book excerpt: Without diesel mechanics, much of the transportation infrastructure in North America would grind to a halt. This book highlights a vital and promising career path for those who are curious about or settled on the automotive arts, and hope to work on buses, construction vehicles, trucks, and many other kinds of machines. An expansive look at this dynamic and hands-on sector is punctuated by vital tips on beginning one's schooling, finding work, and advancing via promotion, as well as mandatory and elective certifications.