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Signaling is full of exceptions, but in very broad terms ... Semaphores indicate stop in the horizontal aspect, proceed at reduced speed (per specific railroad rule) in the diagonal aspect, and proceed at maximum authorized track speed in the vertial aspect. This works the same whether the semaphore is upper- or lower-quadrant. Many semaphores do not have the diagonal aspect; to get a third aspect two blades are needed in combination (SP and UP Harriman standard). Position lights replicate the semaphore arm's three aspects with three plain lights. The PRR and N&W were the major users of position lights; one of the best place to still see them is just east of Chicago along the Skyway. Color position lights replicate the semaphore arm's aspects with three lights, and use the common colors as well -- red indicates stop, yellow reduced speed, green proceed. The B&O was the major user of the CPL; it installed them on the Alton when it owned it. Later this was the GM&O, then CM&W, then SPCSL, and now UP. Cab signals are in broad use. UP has them on the former C&NW main line in lieu of wayside signals, and on its own main line between Omaha and Ogden to supplement wayside signals. Torpedos to my knowledge are no longer in use. Yes, they're loud enough to hear in the engine. They're powerful enough to remove a hand from someone.
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