SP S6 page
The SP owned a total of seventy ALCO S6 switch engines configured originally as switcher and as road units. Neither the T&NO nor the SSW rostered any examples of the S6.
Original orders:
SP:
| Orig. road numbers | ALCO const. no. | build date |
| SP 1033-1039 | 80923-80929 | 5/1955 |
| SP 1040-1051 | 81290-81301 | 5-6/1955 |
| SP 1052 | 81433 | 12/1955 |
| SP 1053-1063 | 81724-81734 | 6-8/1956 |
| SP 1064-1072 | 81805-81813 | 8-9/1956 |
| SP 1073-1078 | 81819-81824 | 11/1956 |
| SP 1079-1090 | 82281-82292 | 11-12/1956 |
| SP 4634-4645 | 81421-81432 | 11-12/1955 |