1990 – Iron Mule Train – Revisited by D.J. Todd (American)
Todd's paper is very readable. See pdf here. Note that although referred to as a "train", Todd appears to have only built one. So the original "train" aspects have been lost. Its interesting to note that "BigDog" does have the concept for a "train", where the lead dog follows its human master, and other 'dogs' …
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