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The cab forward developed by SP was an attempt to do away with the relayers. The engine crew was moved closer to the "action", but then they couldn't see well down the long boiler to the rear. If you look at a cabforward, they still had the now-rear porch for the relayers to watch to the rear. Since there was less to do in that position, SP promptly eliminated one relayer on most runs. There had been two before. Honest.
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