| Class 1550 | |
| Powertype: | Diesel-electric |
| Builder: | Montreal Locomotive Works |
| Buildmodel: | MX 620 |
| Operator: | Comboios de Portugal |
| Operatorclass: | Série 1550 |
| Locale: | Portugal |
| Firstrundate: | 1973 |
The Série 1550 are a series of 19 diesel-electric locomotives built for the Portuguese Railways (CP). They entered service in 1973; they were built in Canada by the Montreal Locomotive Works (MLW).[1] The locomotives are MLW's type MX 620 design.