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- Bandicoot: (QLD) an EMU with a distinctive grey band painted across the cab wind shields.
- BETY: QR pacific type BB18¼ 4-6-2 steam locomotive used on express passenger and freight trains. Named after the telegraphic code.
- Blue babies: QR DD17 class suburban tank engine, in a blue midway between Navy and Sky blue.
- BOG : the light indicating the end of the train (Battery-operated Guard).
- Broad gauge: (QLD) standard gauge, as Queensland runs a 'narrow' 3′ 6″ Cape Gauge
- Brown bomber: a QR C17 4-8-0 (2D) steam engine, typically painted brown.
Read more about this topic: Glossary Of Australian Railway Terms