The Government Says

Memorandum of Understanding between Secretary of State and Welsh Ministers: applying the Railways Bill in Wales

Memorandum of Understanding between Secretary of State and Welsh Ministers: applying the Railways Bill in Wales
Local copy of mou-between-welsh-ministers-and-sos-railways-bill.pdf

https://www.gov.uk/government/publications/memorandum-of-understanding-between-secretary-of-state-and-welsh-ministers-applying-the-railways-bill-in-wales

seen at 18:33, 25 March in Policy papers and consultations.