The ones me and AC were buying were branded 'Daiso' (if I recall correctly), that one looks more like a Kansai based on the connector types and the battery compartment. If so they are roughly the same scale/axle-width as the Tomy trains, however I can't guarantee that they would run as well on blue track as Tomy...
Hope this helps
Hope this helps
Happily collecting things all my life... 
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