Withdrawals started in 1936 when four (7278, 7287, 7303 and 7308) were sold to Sir Robert McAlpine and Son, the latter concern also having five on loan from late 1936 to mid-1938.
The 21-arch single track viaduct was one of the largest engineering undertakings using concrete without reinforcing when it was built by Sir Robert McAlpine.
The song "McAlpine's Fusiliers" (written by Dominic Behan and made famous by "The Dubliners") described the realities of life on the building site for many Irish expatriates.
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Along with Sir Robert McAlpine and George Wimpey, Laing is mentioned in the opening preamble to the 1960 Dominic Behan satirical Irish ballard McAlpine's Fusiliers.