Sentence:  "But it's too far—must be a quarter of a mile—and I've a portmanteau to carry." ... / "Garn!" shouted the guard. "Taint ten <WSD>chain</WSD>. ..." 
Meaning of the word marked with <WSD> tags:  A unit of length equal to 22 yards. The length of a Gunter's surveying chain. The length of a cricket pitch. Equal to 20.12 metres, 4 rods, or 100 links.