(16 Jan 2017, 12:44 pm)mb134 wrote If they are to be replaced, they'll be replaced by brand new vehicles. Can't imagine Arriva would replace them with anything else, and potentially face the issues that 7501-9 gave them.
If they replace them, I think the most logical solution would be to replace 7534-40 at Darlington / Belmont with new Enviro 400 MMC's then use 7534-40 plus 7518 to replace 7501-09, therefore keeping all vehicles the same type.
2x best performers of 7501-09 get kept back as spares with the rest being dispersed nationally to other Arriva divisions with double deck Sapphire services.