SP 4050-4079:
These units were built as SP units and renumbered as part of the SP's 1965 systemwide locomotive renumberign plan.
1965 NUMBERS:
SP 4050-4073:
| 1965 road number | Orig. road number | notes |
| SP 4050 | SP 7200 | |
| SP 4051 | SP 7201 | |
| SP 4052 | SP 7202 | |
| SP 4053 | SP 7203 | |
| SP 4054 | SP 7204 | |
| SP 4055 | SP 7205 | |
| SP 4056 | SP 7206 | |
| SP 4057 | SP 7207 | |
| SP 4058 | SP 7208 | |
| SP 4059 | SP 7209 | |
| SP 4060 | SP 7210 | |
| SP 4061 | SP 7211 | |
| SP 4062 | SP 7212 | |
| SP 4063 | SP 7213 | |
| SP 4064 | SP 7214 | |
| SP 4065 | SP 7215 | |
| SP 4066 | SP 7216 | |
| SP 4067 | SP 7217 | |
| SP 4068 | SP 7218 | |
| SP 4069 | SP 7219 | |
| SP 4070 | SP 7220 | |
| SP 4071 | SP 7221 | |
| SP 4072 | SP 7222 | |
| SP 4073 | SP 7223 |
SP 4070-4083:
| 1965 road number | Orig. road number | notes |
| SP 4074 | SP 7224 | |
| SP 4075 | SP 7225 | |
| SP 4076 | SP 7226 | |
| SP 4077 | SP 7227 | |
| SP 4078 | SP 7228 | |
| SP 4079 | SP 7229 | |
| SP 4080 | SP 7230 | |
| SP 4081 | SP 7231 | |
| SP 4082 | SP 7232 | |
| SP 4083 | SP 7233 |
SP 4084-4087:
| 1965 road number | Orig. road number | notes |
| SP 4084 | SP 7234 | orig. EMD 5625; demonstrator |
| SP 4085 | SP 7235 | orig. EMD 5626; demonstrator |
| SP 4086 | SP 7236 | orig. EMD 5627; demonstrator |
| SP 4087 | SP 7237 | orig. EMD 5628; demonstrator |