Dead-Man switch in locomotives
I found this interesting…
Observatory – Absence of Chemicals Signals an Ant’s Death – NYTimes.com
Locomotives and other equipment often include a fail-safe mechanism known as a dead-man switch. If the operator lets go of the engine throttle for more than a prescribed amount of time, for example, the locomotive will shut down — the assumption being that the operator is dead (or otherwise incapacitated) and there’s a risk of a runaway train.
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