Abstract: A light waveguide coupling device which is inserted at regular intervals along the light wave transmission link with each coupling device for each direction of transmission having a channel having a transducer module for converting optical signals into electrical signals, a regenerating amplifier to amplify the electrical signals and a transducer module for converting electrical signals back into optical signals for further transmission characterized by at least one external electrical connection terminal for each channel so that a remote control element can be connected into the waveguide system at the coupling device.

Abstract: The signal term to be transmitted to a railroad traction vehicle is formed in a signaling system in that each element, from a destination element back to a start element has a respective top speed assigned thereto as an identification. The identification is transmitted element-by-element back to the start element and is devalued during relaying thereof when the identification is greater than that prescribed for a travel path element having a lower assigned top speed so that the identification received at the start element indicates the top speed admissible for the route. The admissible top speed is then converted into a corresponding signal term.