SFEX 4203 was an MLW C-424 purchased from Canadian Pacific.
- Built by MLW as CP 4206 in 1965 (serial number 84844) and classified as DRS-24b.
- Rebuilt by CP as CP 1103 in 1995 as a control cab (traction motors and engine removed).
- Rebuilt by IRSI in Moncton in 2004 as an operating locomotive.
It was lettered SFEX. It was delivered to ERS at the very end of 2004.