Interesting regarding the replacement to the DDs
Meanwhile, tenders have been called for a new fleet of eight eight-car trainsets, with aim of introducing a modern fleet on the route from 2029. The next generation Enterprise trains were initially described as tri-modes, but Railway Gazette International understands that they will primarily be electro-diesel multiple-units, fitted with small traction batteries to reduce emissions at stations and depots. The trains will remain largely dependent on their diesel powerpacks in the early years, pending a firm decision on how or whether to electrify more of the route between the two cities.