viaduct

What it means

1. transportA bridge with several spans that carries rail or road traffic over a valley or other obstacles.

   The L.C.C. [London County Council] considers viaducts in London objectionable and a hindrance to town planning and would like to abolish all the Southern Railway lines on viaducts in South London. [Nothing much happened, they still exist.]

   1944 January and February, C. F. Cobon, “The County of London Plan”, in Railway Magazine, page 24

   1 more example

   […] St. Bede's at this period of its history was perhaps the poorest and most miserable parish in the East End of London. Close-packed, crushed by the buttressed height of the railway viaduct, rendered airless by huge walls of factories, it at once banished lively interest from a stranger's mind and left only a dull oppression of the spirit.

   1918, W[illiam] B[abington] Maxwell, chapter VII, in The Mirror and the Lamp, Indianapolis, Ind.: The Bobbs-Merrill Company, →OCLC

In a sentence

[…] St. Bede's at this period of its history was perhaps the poorest and most miserable parish in the East End of London. Close-packed, crushed by the buttressed height of the railway viaduct, rendered airless by huge walls of factories, it at once banished lively interest from a stranger's mind and left only a dull oppression of the spirit.

1918, W[illiam] B[abington] Maxwell, chapter VII, in The Mirror and the Lamp, Indianapolis, Ind.: The Bobbs-Merrill Company, →OCLC

Where it comes from

1. Latinvia“highway; road”
2. Englishviaduct

Coined in 1816, from Latin via (“highway; road”) + English -duct, on the basis of aqueduct.