As a sibling of yours pointed out above, the train worked with CMGs, their energy usage seems not too much: "CMGs are also far more power efficient. For a few

As a sibling of yours pointed out above, the train worked with CMGs, their energy usage seems not too much: "CMGs are also far more power efficient. For a few hundred watts and about 100 kg of mass, large CMGs have produced thousands of newton meters of torque. A reaction wheel of similar capability would require megawatts of power."