SP&S 63 was built as GN 200, SP&S 64 was built as GN 201. Both were aquired by the SP&S on 3/1/63. Both were sent to Alco Products for tradein credit on 9/1/65. Apparently the Monon leased the two engines from Alco while the road rebuilt the 20 series RS-2's in Lafayette during 1965/66. After it's stay on the Monon, SP&S 64 was sold to the L&N and rebuilt at Louisville as RS-3 #104 (2nd) using components from a wrecked L&N FA. SP&S 63 most likely went to scrap.
Steve