6. Conclusion
Friction control at the wheel-rail contact has improved considerably since the widespread use of variable-speed electric drives combining AC traction motors, sensors, microprocessors and on-board computers, linked by local computer networks.
At both ends of the effort-speed plane, in both traction and braking, grip is the fundamental issue: it enables increased towed loads and acceleration, as well as shorter stopping distances.
For the same stopping distance, improved grip means higher average commercial speeds. The profitability of rail transport and its low energy costs depend on it.
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