Embodiments discussed herein are directed to managing the heat content of two vehicle subsystems through a single coolant loop having parallel branches for each subsystem. The method for operating a steam turbine power plant comprises at least one steam generator which is fired with a solid, granular fuel, for example with brown coal, wherein the fuel is first subject to an indirect drying in a fluidized bed drier and the fluidized bed drier is at least partially heated with steam from the water-steam cycle of the steam generator. Multiple modules are networked so that each module is connected to a master controller so that if one module is removed from operation, the other is able to continue operation. The driving unit allows a diffusion intensity ratio of the light emitted from the illumination unit in a dual-view mode to be higher than the diffusion intensity ratio in a normal mode by switching the magnitude of the voltage applied to the electrode. Preferably, two or more communications networks are included to provide the communications service.