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Tunnel Motors
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I recently rewatched several videos that included both older SP and newer UP/SP in the Donner Pass area. In the older videos nearly all trains were pulled by pure sets of "Tunnel Motors". In the newer videos what tunnel motors were included in the consists were in the minority, and could be seen anywhere in the consists. Even though some tunnels and snowsheds have been removed, it seems like many of the conditions that led to designing tunnel motors in the first place still exist. Have the newer locomotive designs cleaned up the exhaust and improved engine cooling (One of the main reasons for tunnel motors in the first place)to such an extent that the tunnel motor design is no longer required? Ron
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