Today I fitted a Neomodium magnet to an ex 3 rail 65 years old H-D Castle with their 1/2in motor (similar to Triang/Hornby X03/4 but not the same). original DC start minimum was 2.8V, 120 ma which reduced to 2.4V 100 ma with the new magnet. A 2 rail H-D R1, slightly newer same type of motor had an initial start of 7.6V 500ma, with the new magnet dropped to 5.6V and 390ma.
Both demonstrate IMHO that the state of the magnet can have quite effect on power needs. Also the variation between apparently similar items in our world.