Why do overhead power lines on railways sag in hot weather? Aren't they tensioned by weights and pulleys to take up the slack? - Quora
![Electric railway journal . ducedspeed. In station yards where it is desirable to reduce thenumber of poles to a minimum, the type of constructionshown in Fig. 3 is used. Here the Electric railway journal . ducedspeed. In station yards where it is desirable to reduce thenumber of poles to a minimum, the type of constructionshown in Fig. 3 is used. Here the](https://c8.alamy.com/comp/2CH084Y/electric-railway-journal-ducedspeed-in-station-yards-where-it-is-desirable-to-reduce-thenumber-of-poles-to-a-minimum-the-type-of-constructionshown-in-fig-3-is-used-here-the-poles-are-staggered-atintervals-of-60-m-and-a-guy-wire-run-from-the-center-of-thespan-to-the-top-of-each-pole-cost-the-catenary-or-second-class-of-overhead-constructionwhile-more-expensive-to-build-is-more-substantial-than-thespan-wire-construction-and-having-fewer-supports-to-be-in-sulated-should-be-more-reliable-and-cheaper-to-maintainfor-speeds-above-50-mph-the-catenary-type-of-construc-tion-must-be-used-2CH084Y.jpg)
Electric railway journal . ducedspeed. In station yards where it is desirable to reduce thenumber of poles to a minimum, the type of constructionshown in Fig. 3 is used. Here the
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