A diesel train forming part of a heritage steam locomotive's journey through Wales will be passing through Powys and Shropshire this week.

A journey of the 60007 Sir Nigel Gresley, a steam locomotive built at Doncaster Works in 1937, will be moving through several Powys stations as it travels from Holyhead to Cardiff on Wednesday, September 18, but replaced by a diesel locomotive ferrying passengers on the next stretch of the journey. 

Built to a design of Sir Nigel Gresley and named after the famed engineer, the locomotive holds the postwar steam record speed of 112 miles per hour, having reached the speed in 1959 while travelling southward from Stoke Bank with a full train of passengers.

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The locomotive was withdrawn from service in 1966 and purchased for preservation the same year, one of six A4s to be preserved.

It is due to depart from Holyhead at 9.10am and will pass through several North Wales stations before heading south, before being replaced at Crewe by two Class 37 diesels for the next leg of the journey. 

These trains are scheduled to pass through Knighton, stopping there at 2.24pm for a service before setting off at 2.51pm.

(Image: RealTimeTrains)

From there the trains will reach Llandrindod Crossing at 3.33pm, Llandrindod station at 3.38pm, Llanwrtyd at 4.16 and Llandovery at 4.44pm.

From there the train heads further into South Wales towards its final destination of Cardiff Central at 7pm.

Note: An earlier version of this story stated that the 60007 Sir Nigel Gresley steam locomotive would be passing through Powys. This has now been corrected to the actual train passing through the area.