Scrabble?! ADHESIONAL

Definitions of ADHESIONAL in various dictionaries:

An adhesion railway relies on adhesion traction to move the train. Adhesion traction is the friction between the drive wheels and the steel rail. The term "adhesion railway" is only used when there is need to distinguish adhesion railways from railways moved by other means, e.g. by a stationary engine pulling on a cable attached to the cars, by railways which are moved by a pinion meshing with a rack, etc. This article focuses on the technical detail of what happens as a result of friction between the wheels and rails in what is known as the wheel-rail interface or contact patch. There are the good forces, e.g. the traction force, the braking forces, the centering forces, all of which contribute to stable running. There are the bad forces which increase costs by requiring more fuel consumption and increasing maintenance that is needed to address fatigue (material) damage, wear on rail heads and on the wheel rims, and rail movement from traction and braking forces. The interface between the wheel and the rail is a specialist subject with continual research being done.