Sentence:  There could be no easy reversion to the pre-electrification timetable, as that provided for working over the Hyndland branch, which no longer existed, and new stations had come into use at Hyndland and Garscadden; moreover, <WSD>water columns</WSD> all along the routes concerned had been removed. 
Meaning of the word marked with <WSD> tags:  a column alongside a railway track used to replenish a steam engine's water supply.