Gas Turbine Engine Heaters

An engine heater system for supplying compressed air to an air brake of a vehicle. The engine heater system including a gas turbine. A compressor fluidly coupled to an air reservoir of the vehicle. The air reservoir fluidly coupled to an air brake of the vehicle. A shaft rotatably attached between the gas turbine and the compressor, and when the gas turbine rotates the shaft, the compressor provides compressed air to the air reservoir of the vehicle for operating the air brake of the vehicle.