This is a raw draft of the Shinkansen N700 in LDD. It's standard 6 studs wide and when I originally designed it, it was more than 60 studs long (for just the engine) so I reduced the size with the engine now being approx. 50 studs and each carriage a little over 30 studs wide. Traditionally you would run 2 engines and 6 carriages (two different stiles for the carriages potentially varying more on the interior but I figure you can also just have 1 engine 2 cars or 2 engine 4 cars perhaps. Could also split it up into 3 separate sets for engine and each car respectively.
As of yet I haven't done any interior design yet which I may add later.