MP U23B Locos
This page is dedicated to MP's fleet of GE U23B units. The MP was the owner of 39 U23B units. These units were interesting as the first few seem to have been delivered riding on standard GE trucks, but later units were delivered riding on the newer FB-2 type trucks more commonly associated with GE's B line of the -7 series.
Original orders:
| Orig. road numbers | model | GE serial no. | build date | notes |
| MP 668-674 | U23B | 38458-38764 | 1/1973 |
| MP 2257-2267 | U23B | 39905-39915 | 11/1974 | |
| MP 2268-2273 | U23B | 40356-40361 | 3/1975 | |
| MP 2274-2278 | U23B | 40920-40924 | 6/1976 | |
| MP 2279-2288 | U23B | 41523-41532 | 1-2/1977 |
U23B: MP 668 38758 1/1973 to MP 2250 to MP 4500 MP 669 38759 1/1973 to MP 2251 to MP 4501 MP 670 38760 1/1973 to MP 2252 to MP 4502 MP 671 38761 1/1973 to MP 2253 to MP 4503 MP 672 38762 1/1973 to MP 2254 to MP 4504 MP 673 38763 1/1973 to MP 2255 to MP 4505 MP 674 38764 1/1973 to MP 2256 to MP 4506 EMD retrofit cab MP 2257 39905 11/1974 to MP 4507 MP 2258 39906 11/1974 to MP 4508 MP 2259 39907 11/1974 to MP 4509 MP 2260 39908 11/1974 to MP 4510 MP 2261 39909 11/1974 to MP 4511 MP 2262 39910 11/1974 to MP 4512 MP 2263 39911 11/1974 to MP 4513 MP 2264 39912 11/1974 to MP 4514 MP 2265 39913 11/1974 to MP 4515 MP 2266 39914 11/1974 to MP 4516 MP 2267 39915 11/1974 to MP 4517 MP 2268 40356 3/1975 to MP 4518 MP 2269 40357 3/1975 to MP 4519 MP 2270 40358 3/1975 to MP 4520 MP 2271 40359 3/1975 wrecked 10/1978 MP 2272 40360 3/1975 to MP 4521 EMD retrofit cab MP 2273 40361 3/1975 to MP 4522 MP 2274 40920 6/1976 to MP 4523 MP 2275 40921 6/1976 to MP 4524 MP 2276 40922 6/1976 to MP 4525 MP 2277 40923 6/1976 to MP 4526 MP 2278 40924 6/1976 to MP 4527 MP 2279 41523 1-2/1977 to MP 4528 EMD retrofit cab MP 2280 41524 1-2/1977 to MP 4529 MP 2281 41525 1-2/1977 to MP 4530 MP 2282 41526 1-2/1977 to MP 4531 EMD retrofit cab MP 2283 41527 1-2/1977 to MP 4532 MP 2284 41528 1-2/1977 to MP 4533 MP 2285 41529 1-2/1977 to MP 4534 EMD retrofit cab MP 2286 41530 1-2/1977 to MP 4535 MP 2287 41531 1-2/1977 to MP 4536 MP 2288 41532 1-2/1977 to MP 4537