Signal aspect
The signal concept is in the railway system the information that a signal representing. This can be, for example, "Stop!", "Drive" or "Slow travel". This information can be expressed optically by shapes ( shape signal ) or by white or colored lights ( light signal ). The representation of signal terms can differ from country to country. It is specified in the signal aspect.
The signal aspect is also referred to as the signal aspect .
At Deutsche Bahn AG , the concept of a signal is only an abbreviation to which a verbal description of the signal, the meaning of the signal , is assigned. For example, the signal aspect Hp0 stands for “stop”, Hp1 for “drive”, Hp2 for “slow drive” and many others. "Hp" and "Vr" are derived from "Haupt (signal)" and "Vor (signal)".
With modern train control systems such as line train control or ETCS , the signal aspect is transmitted directly to the driver's cab of the respective locomotive . In this case, for more than one section a movement authority (Engl. Movement Authority, MA) are passed to the train, possibly up to a final section with restrictive information.