A supply rail for a vehicle includes a first busbar which is designed to provide electrical energy with a first supply voltage for supplying energy to a large number of electrical modules of the vehicle. In this case, the electrical modules of the large number of electrical modules are arranged at different points of the vehicle. The supply rail includes means for data transmission designed to allow data interchange between at least two of the large number of electrical modules. The supply rail has a large number of slots for the large number of electrical modules, wherein a first slot of the large number of slots is designed to connect a first electrical module of the large number of electrical modules to the first busbar and to the means for data transmission by way of a first plug connection. The supply rail includes a temperature-control duct which is designed to conduct a thermally conductive medium past the large number of electrical modules.