The first time I heard the sound of a diesel train was about fifteen years ago in Le Puy, in Haute-Loire. This train ran on a winding track over the Monts du Velay past Fix St. Geneys and down to St.

You may have noticed that diesel engines are much louder than their gasoline counterparts, and you probably questioned why that was the case. While a noisy engine is usually a sign of trouble, that's ...