
The choice between a vacuum pump and a vacuum ejector will depend on the specific requirements of the train's brake system. If the miniature locomotive train is powered by a steam locomotive, a vacuum ejector may be the more traditional and authentic choice for creating a vacuum in the brake system. This is because a vacuum ejector uses steam from the locomotive's boiler as the motive fluid, which is readily available and does not require an additional power source. A vacuum ejector can also be relatively inexpensive and easy to maintain, making it a practical choice.