1,400 horsepower
A1A-A1A trucks
Weight – 238,00 lbs.
Tractive effort – 30,000 lbs.
In XXXX MLW offered a program to CN that would replace 244 engines in FPA-2 locomotives with upgraded 251 engines, essentially making them FPA-4s. Part of this program was the use of the used 244 engines in the RSC-24 locomotives. CN’s four RSC-24s were the only ones built.
| Road no. | Class | Build date | Builder’s no. | Retired | Notes / disposition |
| 1800 | MR-14a | Mar 59 | 82589 | May 18 76 | |
| 1801 | MR-14a | Mar 59 | 82590 | Sep 24 75 | |
| 1802 | MR-14a | 1959 | 82591 | Aug 19 69 | Wrecked at Point A’ Lea Garde QC May 21 69. Was lead unit on passenger train (Le Chaleur) with no. 3874, head-on collision with freight train with No. 3851, 3863, 3859. All units except No. 3859 were retired. |
| 1803 | MR-14a | Apr 59 | 82592 | Nov 10 75 |