| Bavarian B IX (old) | |
| Bgcolor: | 0081FF |
| Color: | FFFFFF |
| Builder: | Strousberg |
| Builddate: | 1870 |
| Totalproduction: | 4 |
| Whytetype: | 0-4-2 |
| Uicclass: | B1 n2 |
| Driverdiameter: | 1412frac=8NaNfrac=8 |
| Serviceweight: | 31.7t |
| Weightondrivers: | 25.2t |
| Tendertype: | 2 T 8 |
| Fuelcap: | 3.5sigfig=3NaNsigfig=3 |
| Watercap: | 8m2 |
| Boilerpressure: | 8.5sigfig=3NaNsigfig=3 |
| Fireboxarea: | 1.3m2 |
| Evaporativearea: | 89m2 |
| Cylindercount: | 2 |
| Cylindersize: | 418frac=16NaNfrac=16 |
| Pistonstroke: | 602frac=16NaNfrac=16 |
| Valvegear: | Allan |
| Maxspeed: | 600NaN0 |
The first four steam locomotives designated as Class B IX by the Royal Bavarian State Railways were procured from the locomotive works of Strousberg. They were transferred in 1872 to the Imperial Railways in Alsace-Lorraine. For the remainder, see Bavarian B IX.
They were equipped with tenders of Class 3 T 10.