MP S12 Locos:
This page is dedicated to MP's fleet of Baldwin S12 yard switchers. The MP was the original owner of 40 S12 units, many of which featured sublettering for various subsidiary roads, but all of which were MP units.
Original Orders:
| Orig. road numbers | model | Baldwin serial no. | build date | notes |
| MP 9200-9219 | S12 | 75033-75052 | 5-9/1951 | |
| MP 9220-9226 | S12 | 75531-75537 | 3-4/1952 | sublettered I-GN |
| MP 9227-9229 | S12 | 75313-75315 | 4/1952 | sublettered StLB&M |
| MP 9230-9232 | S12 | 75528-75530 | 4/1952 | sublettered I-GN |
| MP 9233-9239 | S12 | 75827-75833 | 4-5/1953 | sublettered Union Rwy of Memphis |
S12: MP 9200 75033 5-9/1951 MP 9201 75034 5-9/1951 MP 9202 75035 5-9/1951 MP 9203 75036 5-9/1951 MP 9204 75037 5-9/1951 MP 9205 75038 5-9/1951 MP 9206 75039 5-9/1951 MP 9207 75040 5-9/1951 MP 9208 75041 5-9/1951 MP 9209 75042 5-9/1951 MP 9210 75043 5-9/1951 MP 9211 75044 5-9/1951 MP 9212 75045 5-9/1951 MP 9213 75046 5-9/1951 MP 9214 75047 5-9/1951 MP 9215 75048 5-9/1951 MP 9216 75049 5-9/1951 MP 9217 75050 5-9/1951 MP 9218 75051 5-9/1951 MP 9219 75052 5-9/1951 MP 9220* 75531 3-4/1952 MP 9221* 75532 3-4/1952 MP 9222* 75533 3-4/1952 MP 9223* 75534 3-4/1952 MP 9224* 75535 3-4/1952 MP 9225* 75536 3-4/1952 MP 9226* 75537 3-4/1952 MP 9227% 75313 4/1952 MP 9228% 75314 4/1952 MP 9229% 75315 4/1952 MP 9230* 75528 4/1952 MP 9231* 75529 4/1952 MP 9232* 75530 4/1952 MP 9233$ 75827 4-5/1953 MP 9234$ 75828 4-5/1953 MP 9235$ 75829 4-5/1953 MP 9236$ 75830 4-5/1953 MP 9237$ 75831 4-5/1953 MP 9238$ 75832 4-5/1953 MP 9239$ 75833 4-5/1953 *sublettered I-GN %sublettered StLB&M $sublettered Union Rwy of Memphis