| 摘要 |
A train which rests on sleepers (2) on the track has pulley wheels (3). At the bottom of the pulley wheels there is a pulley wheel throat (17) with a convex curvature and has a cross-section slightly less than a semi-circumference. A cylindrical rail head (5) has a web (6) and is approximately semi-circular in cross-section. The rail head has a radius slightly less than the wheel pulley throat.
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