Electrical blasting cap. Unstable compounds such as high explosives require initial shock or other disturbance to set off the chemical reaction. A blasting cap is usually used to set off Primacord, which in turn sets off shaped charges.
A percussion cap which can be clipped to the rail and detonated by the wheels of a locomotive passing over it. This provides an audible warning, particularly useful in foggy conditions where semaphore signals are employed.
A disc shaped small explosive with pliable metal clips which are placed on the top surface of the rails to warn drivers that a signal obscured by fog is at danger or that there is an obstruction ahead.
A railway detonator (also called a torpedo in the U.S.) is a device used to make a loud sound as a warning signal to train drivers. The detonator is the size of a large coin with two lead straps, one on each side. The detonator is placed on the top of the rail and the straps are used to secure it so that it does not fall off.
Detonator made history when it first appeared in the Americana section of Worlds of Fun as being the first "space shot" ride of its type in the United States. Also it was the first to have a twin-tower form. Detonator launches riders 200 feet in the air only to fall right back down.