Lighting system for a mass transport means, comprising: • a power supply device for providing a predesignated electrical power supply voltage; • a current-conducting device which is electrically conductively connected to the power supply device and to at least one light-emitting means; and • a main control device which is provided to transmit an operating signal to the at least one light-emitting means via the current-conducting device; characterized in that • a first supply line and a second supply line form the current-conducting device, wherein the first supply line is connected to a first supply connection of the power supply device and the second supply line is connected to a second supply connection of the power supply device; • the main control device is connected to the first supply line and to the second supply line; • at least two illumination devices (6, 6a) are provided, and each illumination device (6, 6a) comprises at least one light-emitting means, a switching device, an auxiliary control device, and a measuring device configured as an ammeter, which are electrically conductively connected to the first supply line and to the second supply line; • the auxiliary control device of each illumination device (6, 6a) receives, via the first supply line and the second supply line, the operating signal transmitted by the main control device and controls an operating state of the at least one light-emitting means of the illumination devices (6, 6a) as a function of the received operating signal; and • the main control device receives from the auxiliary control device, via the first supply line and the second supply line, an operating state signal of one of the illumination devices (6, 6a). • a power supply device for providing a predesignated electrical power supply voltage; • a current-conducting device which is electrically conductively connected to the power supply device and to at least one light-emitting means; and • a main control device which is provided to transmit an operating signal to the at least one light-emitting means via the current-conducting device; • a first supply line and a second supply line form the current-conducting device, wherein the first supply line is connected to a first supply connection of the power supply device and the second supply line is connected to a second supply connection of the power supply device; • the main control device is connected to the first supply line and to the second supply line; • at least two illumination devices (6, 6a) are provided, and each illumination device (6, 6a) comprises at least one light-emitting means, a switching device, an auxiliary control device, and a measuring device configured as an ammeter, which are electrically conductively connected to the first supply line and to the second supply line; • the auxiliary control device of each illumination device (6, 6a) receives, via the first supply line and the second supply line, the operating signal transmitted by the main control device and controls an operating state of the at least one light-emitting means of the illumination devices (6, 6a) as a function of the received operating signal; and • the main control device receives from the auxiliary control device, via the first supply line and the second supply line, an operating state signal of one of the illumination devices (6, 6a).