The J50 is a stunning
The J50 is a stunning loco. With fantastic weight to it to really give the pulling and pushing power of this little loco.
Details are fantastic, some are a little simple looking but for the scale and location of these they are definitely accessible. Comes with a prefitted speaker and 6 pin socket. But not really space for a stay alive. Personally for DC this a a fantastic loco. On DCC it would benefit of something possible to have a stay alive without having to remove weight. However you can could use the cab for that.
The cab however does a have nice lot of detail.