SP 6000B,C-6004B,C
These units were built with alpha suffixes. Over the years, various modifications were done to these units. They were renumbered to SP 5900-5909 in 1949.
SP E7B's - class DP-4 - EMD const. numbers 4218-4223, 4155-4157, 4217:
| Original number | 1949 number | notes |
| SP 6000B | SP 5900 | |
| SP 6000C | SP 5901 | |
| SP 6001B | SP 5902 | |
| SP 6001C | SP 5903 | |
| SP 6002B | SP 5904 | |
| SP 6002C | SP 5905 | |
| SP 6003B | SP 5906 | |
| SP 6003C | SP 5907 | |
| SP 6004B | SP 5908 | |
| SP 6004C | SP 5909 |