Class 58 - Mainline Blue - 5804658046 was handed over to BR during October 1986. Nearing the end of the Class 58 build programme, it had all of the later modifications incorporated from new. It was one of the unnamed members of the class until 7th July 1991, when it was named Thoresby Colliery and outshopped in a gleaming coat of Triple Grey with Coal Sector branding. The naming ceremony took place at the High Marnham Power Station open day, not far from the colliery it was named

C Beaumont and represented a quantum leap forward in Irish locomotive design

Diesel locomotives were considered

BR green with no yellow nose panels

since late 2024

It was rebuilt at Brush Wabtec during 2015 and entered traffic with Caledonian sleeper the same year

58023 was a typical mid-batch locomotive

spending most of it in and around the NCB’s Hem Heath wagon workshops

420 turnouts and magnetic accessories (DCC or Motorola®)

Original 5-rib body style with roller bearing and grease axle boxes

self-centring NEM housings

The only modification to justify the renumbering was the fitment of through ETS wiring allowing double heading with an electrical train supply-equipped Class 31/4

2b/c Passenger Coach - IR Orange - 4 Coach Pack D