The locomotives were built by various manufacturers from 1880 to 1881.
The machines had an outside frame with the cylinders and the Walschaert located inside the frame.
Starting with 1900 the machines received new boilers, with overall weight increasing to 32 t (31.49 long tons; 35.27 short tons).
Production quantities[3]
| Manufacturer | Serial numbers | Quantity |
Date in service | État Belge Numbers |
| Franco-Belge | 326–335 | 10 |
1881 | EB 1220–1224, 1278–1282 |
| Franco-Belge | 340–341, 343, 342, 339, 344–345, 349–350, 355, 351 | 11 |
1881 | EB 1357–1367 |
| Saint-Léonard [fr] | 552–558 | 7 |
1881 | EB 227, 229, 536, 564, 862, 971, 1425 |
| Franco-Belge | 354, 353, 356, 358, 357, 360, 359, 361 | 8 |
1881 | EB 1426–1433 |
| Zimmermann-Hanrez | 76 | 1 |
1900 | EB 1218 (Type 5bis, possibly a rebuild) |