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Takara has a bit of a problem with MP Raiden if they do try to keep things to scale. Japan gives zero fucks about any scale of train smaller than HO, and even the HO selection there pales in comparison to their choices to N and Z. The thing is HO scale Raiden limbbots would be about as large as the Rail Racer bots were, and that's not really MP-sized.
MP Raiden'll probably be nonscale in that case, but somewhere around 1/87-1/50 scale-wise