SP SW900 page: GRIP Program
GRIP Program:
The SP began a large scale program to rebuilt its many locomotives called the GRIP (General Rehabilitation and Improvement Program) in 1970. It encompassed many models of locomotives, one of which the EMD SW900 switchers were a part.
| GRIP number | prev. number | orig. number |
| SP 1190 | SP 1175 | SP 4629 |
| SP 1191 | SP 1177 | SP 4631 |
| SP 1192 | SP 1178 | SP 4632 |
| SP 1193 | SP 1172 | SP 4626 |
| SP 1194 | SP 1173 | SP 4627 |
| SP 1195 | SP 1176 | SP 4630 |
| SP 1196 | SP 1174 | SP 4628 |
| SP 1197 | SP 1179 | SP 4633 |
| SP 1198 | SP 1170 | SP 4624 |
| SP 1199 | SP 1171 | SP 4625 |