
- Secondary suspension recognisable as double spring
- Bogie multi-part, thus: round secondary spring, to-scale side plate, integrated current pick-up, wheelsets in toe bearing
- Bellow replaceable pushed in or extended
- Multi-part braking system with brake callipers in wheel plane

One of the first iron express train cars of the K.P.E.V. was the later AB 4ü Pr 15. Since no style sheet existed for the iron express train cars the waggon plants had liberties regarding construction and design. Thus, the roof endings of these waggons distinctly differ from other shipments.
| Prussian Steam Locomotive S 9 Class Item no. 40270 | ||||||
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