SIGNAL BOXES DEVELOPMENT AND CURRENT TRENDS
LES POSTES DE SIGNALISATION-EVOLUTION ET TENDANCES ACTUELLES
The development of signal boxes on the SNCF has been directed mainly to concentration and extension of the area controlled by each box. In the circumstances, mechanical and electro-mechanical boxes have been practically eliminated. "All-relay" electric boxes have reached a satisfactory stage of technological development in the form of PRS-NS1 boxes. Certain variants of the conventional PRS box are however of special interest. The main variant is the PRGS or the Simplified Geographical All-Relay Box. This is an adaptation to SNCF requirements of boxes with a geographical structure and an "entry-exit" pubh-button table, as used by several European railways. The PRGS boxes are not equipped for pre-setting which is no disadvantage for the applications planned, i.e. for medium-sized stations, and consequently they represent an appreciable saving. Another variant is the "turn-push" handle type of box. The handles may be "individual" ones and form the basis of the PRMI which is replacing the PELI: track handle boxes can also be built especially for controlling the head of a set of service sidings. From the technological aspect, NS1 relays are being introduced at the same time as static components which seem to be very suitable for PRGS boxes.
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Corporate Authors:
Societe Nationale des Chemins de Fer Francais
92 rue Bonaparte
75 Paris 6e, France -
Authors:
- WEBER, O
- Huet, J
- Publication Date: 1972-10
Language
- French
Media Info
- Pagination: p. 633
- Serial:
Subject/Index Terms
- TRT Terms: Signaling; Technology
- Identifier Terms: Societe nationale des chemins de fer francais
- Geographic Terms: France
- Subject Areas: Railroads;
Filing Info
- Accession Number: 00047812
- Record Type: Publication
- Source Agency: International Union of Railways
- Files: TRIS
- Created Date: Jan 4 1976 12:00AM