This is what Deltics were designed and built to do,

namely running at up to one hundred miles per hour on the ECML between Scotland and London, something that they did for twenty years. Having recently been completely refurbished by the Deltic Preservation Society at its Barrow Hill base 55009 'Alycidon' passes Tallington at line speed working The Capital Deltic Reprise charter. At this point the train was running some thirty minutes late having made up the same in deficit being delayed by an hour leaving Burton Ot Wetmore sidings where the service originated. Evidently, the delay was caused by paperwork relating to the stock not being in order necessitating some shunting of the coaches before a departure was authorised.