ESU 50012 ECoSBoost - 7A External Booster/AmplifierESU 50012 ECoSBoost 7A External Booster Amplifier Amplifiers (also called "boosters") are indispensable components of every large model railway system: If the power consumption of all moving trains with their functions, the lighting of the carriages and functional models is greater than the maximum current that the central unit can supply, you must divide your system into several supply sections, each of which is supplied by its own booster. The