Not to start a major argument here, but one of the best kept secrets is that the tortoise has an inherent non-derailing feature, without adding any additional electronics, for most heavier cars and engines. If you adjust the spring tension on a tortoise, it behaves like a spring-loaded slip switch that many of us use in reversing loops. Many times I've forgotten to change the position of a switch for a train coming in from the "wrong" direction and never had a derailment. This effect has been reported by others in older posts.
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