This down-on image of DSS&A 101 reveals that somewhere in its history it acquired a circular fan housing instead of the standard square unit with shutters, common to 539-engined Alco-GE power. Even though the Genessee & Wyoming had a similarly-modified example, the last RS-1s built, Grand Trunk Western 1950-1951, were provided with the angular fan shroud.
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To add more to the first comment. The 101 was sold by the Soo Line back to Alco where it was rebuilt and updated.
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