Installation for powering and controlling a plurality of signalling lights arranged in series, each of the signalling lights comprising at least one light source (L1,L2), the installation comprising: - a management unit for remotely programming/managing operation of the installation, including an upstream primary power supply; - a primary series circuit for powering the signalling lights, including a chain of transformers wherein each transformer of the chain of transformers is for powering a respective signalling light of the plurality of signalling lights and wherein a primary winding of each transformer of the chain of transformers is connected in series to the primary power supply; - a series of control modules (300, 300m, 300n), wherein each control module is for controlling a respective one of said signalling lights and is configured to be electrically arranged between a respective transformer of the chain of transformers and the associated signalling light; - a first optical cable for bidirectionally connecting the first upstream control module of the series of control modules to the management unit; - a second optical cable for bidirectionally connecting the last downstream control module of the series of control modules to the management unit; - each control module of the series of control modules arranged between the first upstream control module and the last downstream control module being connected in series to an adjacent upstream control module and to an adjacent downstream control module by means of a respective bidirectional optical connection; thereby forming: a first bidirectional communication optical channel which connects in series at least the management unit, the first control module of the first upstream signalling light and the following control modules, in a transmission direction from upstream to downstream and in a reception direction from downstream to upstream; and a second bidirectional communication optical channel which connects in series the management unit, the control module of the last downstream signalling light and the preceding control modules, in a transmission direction from downstream to upstream and in a reception direction from upstream to downstream; characterized in that the installation further comprises a secondary power supply circuit for powering the control modules, independent of the primary series circuit and primary power supply for powering the signalling lights. - a management unit for remotely programming/managing operation of the installation, including an upstream primary power supply; - a primary series circuit for powering the signalling lights, including a chain of transformers wherein each transformer of the chain of transformers is for powering a respective signalling light of the plurality of signalling lights and wherein a primary winding of each transformer of the chain of transformers is connected in series to the primary power supply; - a series of control modules (300, 300m, 300n), wherein each control module is for controlling a respective one of said signalling lights and is configured to be electrically arranged between a respective transformer of the chain of transformers and the associated signalling light; - a first optical cable for bidirectionally connecting the first upstream control module of the series of control modules to the management unit; - a second optical cable for bidirectionally connecting the last downstream control module of the series of control modules to the management unit; - each control module of the series of control modules arranged between the first upstream control module and the last downstream control module being connected in series to an adjacent upstream control module and to an adjacent downstream control module by means of a respective bidirectional optical connection; thereby forming: a first bidirectional communication optical channel which connects in series at least the management unit, the first control module of the first upstream signalling light and the following control modules, in a transmission direction from upstream to downstream and in a reception direction from downstream to upstream; and a second bidirectional communication optical channel which connects in series the management unit, the control module of the last downstream signalling light and the preceding control modules, in a transmission direction from downstream to upstream and in a reception direction from upstream to downstream; characterized in that the installation further comprises a secondary power supply circuit for powering the control modules, independent of the primary series circuit and primary power supply for powering the signalling lights.