It would layer on to east coast mainline and Maybe it could have a Scarborough route It was built in Germany
Well yes, but on the ECML section we have it would be only be AI at Doncaster. If it was to come it would be as a DLC for MAC. Although it could come as a train in a route of course. Side note I love when the PA at Doncaster is announcing a Cleethorpes service at Doncaster when it's 6 coaches because it's like "some station have short platforms, if you are travelling to..." and then lists every station aside from Cleethorpes
Doncaster to Cleethorpes would be a good pick as its the main train for the route and the only one that does the full length. Also my local line, so there's that I guess.