Hey !
I made this LNER A1 Flying Scotsman for my layout a few month ago. It is made in 6 wide.
The engine is powered by a powered up L motor located between the boiler and the cab. The hub takes place in the tender. It can run pretty quickly on R40 curves with a heavy load thanks to the L motor.
Hope you’ll all enjoy it !
Link to the english full prentation :  [MOC] [Instructions] Flying Scotsman 6-wide - LEGO Train Tech - Eurobricks Forums
Link to the french full presentation :  [MOC] Mes Trains
You can also check out my Instagram page @sebulba_creations
Note that the train tracks are not included.