| NMBS/SNCB Type 1 | |
| Powertype: | Steam |
| Builder: | Société Anonyme la Métallurgique, Tubize |
| Builddate: | 1935 - 1938 |
| Totalproduction: | 35 |
| Whytetype: | 4-6-2 |
| Uicclass: | 2′C1′ h4 |
| Driverdiameter: | 19802NaN2 |
| Locoweight: | 124t |
| Tenderweight: | 86t |
| Watercap: | 48000L |
| Boilerpressure: | 18sigfig=3NaNsigfig=3 |
| Feedwaterheater: | ACFI |
| Firearea: | 5m2 |
| Totalsurface: | 234.8m2 |
| Superheaterarea: | 111.7m2 |
| Cylindercount: | Four |
| Cylindersize: | 420x |
| Tractiveeffort: | 198.9-1NaN-1 |
| Operator: | NMBS/SNCB |
| Operatorclass: | Type 1 |
| Fleetnumbers: | 101 - 1351.001 – 1.035 |
| Withdrawndate: | 1962 |
| Preservedunits: | One: 1.002 |
| Disposition: | 1 preserved, 34 scrapped |
The NMBS/SNCB Type 1 was a class of steam locomotives built in 1935 and 1938 for working heavy express passenger trains operated by the National Railway Company of Belgium (NMBS/SNCB).
Thirty five type 1 locomotives were built by the Société Anonyme la Métallurgique at its Tubize factory. They had a high degree of superheat, and a firebox that was so wide, it had two firehole doors. The members of the class were retired in 1962.
One locomotive, no. 1.002, has been preserved by the NMBS/SNCB. It is displayed at the Treignes railway museum of heritage railway CFV3V (Chemin de fer à vapeur des trois vallées) in the far south of Belgium.
. Oswald Nock . 1970 . Railways at the Zenith of Steam 1920–40 . London . Blandford Press . 175, 177 . 0-7137-0515-9 .