| REPORTING MARKS | NUMBER BUILT | BUILDER & DATE | NOTES |
|---|---|---|---|
| ERIE 7800-7849 | 50 | PS But 1956 | 79'-6" IL, lot 8339A, leased from Piggyback Inc. |
| KCS 700-749 | 50 | PS But 1956 | 79'-6" IL, lot 8339, leased from Piggyback Inc. retired before 1963 |
| NH 18000-18001 | 2 | NH Reading 2-55 | 75'-1" IL, prototypes |
| NH 18100-18299 | 200 | PS But 1956 | 79'-6" IL, lot 8296, leased from Piggyback Inc. retired by 1963 |
| SP ?? | 1 | SP | 79'-6", prototype |
| SP 510500-510649 | 150 | SP Sacramento 1957 | 79'-6" IL, Class F-50-17 reblt to 85' by 1962 |