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Centralized traffic control — (CTC) is a signalling system used by railroads. The system consists of a centralized train dispatcher s office that controls railroad switches in the CTC territory and the signals that railroad engineers must obey in order to keep the traffic… … Wikipedia
A-group — In mathematics, in the area of abstract algebra known as group theory, an A group is a type of group that is similar to abelian groups. The groups were first studied in the 1940s by Philip Hall, and are still studied today. A great deal is known… … Wikipedia
Duckmanton — Coordinates: 53°14′31″N 1°19′44″W / 53.242°N 1.329°W / 53.242; 1.329 … Wikipedia