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The K7 bogie is currently one of the most effective bogie products in the field of railway freight cars for reducing wheel-rail wear. This bogie facilitates radial alignment of the wheel sets when the train passes through curves, reducing wheel-rail flange contact and significantly reducing lateral forces on the track, thereby effectively reducing wheel-rail wear, extending wheel life, and minimizing damage to the track, roadbed, and switches.
When running straight, the wheel sets are in the correct position, but when passing through curves, the wheel sets tend to align radially, reducing flange contact and lateral forces on the rails, reducing rolling resistance of the wheels, and saving locomotive traction energy consumption.
| Track gauge | 1435mm |
| Tare weight | 4.8t |
| Axle load | 2t |
| Commercial operation speed | 120km/h |
| Min.radius of curvature negotiable | 145m |
| Diameter of wheel | 840mm |
