No they don't all have them. Usually they do, some even have two, but I've gotten on trains that were tied down and no reverser was to be found on any of the units. That's why I have a couple spares with me, one of which is always in my pocket. The worst case was one time called for a light power move of eight engines. None of them had one and they just came out of a shop for some warranty work.You don't think there is a reverser in the cab of the locomotive? Every locomotive I've been in had one in it, even all of the trailing units.
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