| 摘要 |
<p>A railway sleeper is in the form of an inverted trough narrower at the top (16) than at the bottom and having a gap (13) in its upper side. The sleeper supports a rail (14) with the bottom of a flange (15), which is at the bottom of the rail, in the gap and lower than the top of the sleeper. The rail is secured by a clip (D), part of which is inside the sleeper and constrained by the narrowness of the top of the sleeper so that the clip cannot turn through a large angle about a vertical axis. The rail may be further secured by a portion (17) of the sleeper overhanging one side of the flange. The clip may be a bent bar of the same cross-section throughout its length and comprising a short upper limb (A) and a longer lower limb (B), slightly arched (1A) and ending in an up-turned part (9), the limbs extending generally in the same direction from a bend (C) which joins them. </p> |
