overclocked

i'm guessing for maintenance reasons

Makes sense since the way they replace rails is by using pre-fabricated sections, but the thing about maintenance isn't satisfying since there are sections of weld rail everywhere but elevated. My thoughts are going into technical difficulties area, maybe elevated lines experience more stress thus weld rail breaks more often, or since its metal structure, maybe the expansion/contraction requires short sections of rail to accommodate it. It seems that this question is stuck with me for goo...

well it seems you answered your own question. I think the open weather makes a big difference as far as the tracks expanding or contracting in the summer and winter.