Rail treatment machine able to be moved on rails

A rail-mounted rail processing machine, comprising:

• at least one traction motor;
• at least one working unit for processing tracks;
• a permanent energy source;
• an electrical energy storage;
• and
• a current collector that provides traction current to the traction motor, and the working unit, the permanent energy source, the electrical energy storage, the current collector, the traction motor and the working unit being connected to a common direct current network via power converters, wherein the permanent energy source is a fuel cell which feeds at least a base load of the working unit into the direct current network via one of the power converters, and wherein, to cover peak loads of at least the working unit, buffer energy of the electrical energy storage acting as a buffer store is feedable into the direct current network via an associated one of the power converters, wherein the base load is a value stored on a memory, which can be adapted via a control unit as a function of travelling speed of the rail processing machine, a process temperature and required aggregate power.