Definition of "knitting"

knitting

/ˈnɪtɪŋ/

verb
1. present participle and gerund of knit
noun
countable and uncountable, plural knittings
1. The action of the verb to knit; the process of producing knitted material.
2. Material that has been, or is being knitted.
3. (rail transport, informal, UK) overhead electrification wires, OHLE
  Quotations
  Fair point. Instead of tearing down the knitting and using diesel, tear down the knitting and use turbines.
  2002 April 26, David Stevenson, “Re: Diesel vs Electric”, in uk.railway‎ (Usenet), retrieved 10 April 2018, message-ID <B8EF5604.1C7F1%hoagy@cix.co.uk>
  It also helps, if: [...] the knitting is aligned with the track below, or rather vice versa, something else that went after 1996.
  2007 October 19, "Capt. Deltic", “Re: GNER knitting down (again)”, in uk.railway‎ (Usenet), retrieved 10 April 2018, message-ID <1192811754.580518.56340@e34g2000pro.googlegroups.com>
  My suggestion would be to electrify the uphill bits only, in each direction, and to use diesel traction when coming down the other side. Massive savings on posts and knitting for a start.
  2016 December 9, Andrew Clarke, “Re: Great Western Railway warns of slower journeys on new trains”, in uk.railway‎ (Usenet), retrieved 10 April 2018, message-ID <111f6d4a-e880-4b12-89f3-04250296ea7d@googlegroups.com>