Single-phase generator The early generators for those single-phase traction networks are single-phase generators. Even with newer three-phase motors which were introduced to some modern trains, the single-phases transmission for traction networks survive their time and are still in use in many railways today. However, many traction power stations have replaced their generators over time to use three-phase generators and convert into single-phase for transmission. In the early development of hydroelectricity, single-phase generators played an important role in demonstrating the benefits of alternating current. In 1891, a 3,000 volts and 133 Hz single-phase generator of 100 horsepower was installed at Ames Hydroelectric Generating
Single-deck bus Single-deck bus A single-decker bus or single-decker is a bus that has a single deck for passengers. Normally the use of the term "single-decker" refers to a standard two-axled rigid bus, in direct contrast to the use of the term double-decker bus, which is essentially a bus with two passengers decks and a staircase. These types of single-deckers may feature one or more doors, and varying internal combustion engine positions. In regions where double-deckers are not common, the term "single-decker" may lack common usage, as in one sense, all other main types of bus have a single deck. Also, the