There's some good early info dotted around on other threads about the forthcoming use of class 387s on the Great Northern routes, but its interspersed with details around the 387s for GWR and GatEx. With that in mind, I thought it might be helpful to start a thread focused on the transition of the move of units from the 387/1 fleet onto GN. As of this morning, I can see that there are 2x8 car units sitting at Hornsey, and I understand the ultimate aim is to transition 29x4 car units over to GN this year, from Thameslink. Is that still correct? It would also be good to keep tabs on: - status of testing and/or driver training, and any potential issues - date of likely introduction into service - which units/diagrams are likely to be replaced first (assuming it would be 317/321 units that will be first to be replaced) - whether the 387s are intended for P'Boro as well as Cambridge/Kings Lynn - whether there's an intention to make any significant timetable changes on the GN routes from the Dec 2018 timetable, to account for the elimination of the (slower) 317/321 fleet Thanks in advance for any information that might be available.