I just received my Great Northern Legacy E6 Atlantic #1707 6-84947 yesterday. Based on the description from the catalog (2017 Signature V2) it was listed as having whistle steam. I know things change from the catalog and when it went up on Lionel's site that had changed to cylinder steam effect emits smoke from the steam chest. Not too big a deal for me, I prefer the whistle smoke over the steam chest smoke but I was fine with that. I was surprised to see on the box that it had the whistle steam.
However in the manual it still shows that it has the steam chest smoke on page 8 and then on page 9 it shows the switch to manually turn off whistle smoke.
To confuse things more the whistle is removable like you're supposed to add smoke fluid there.
I risked it and only added smoke fluid where the manual indicates. This worked and I have the whistle steam effect and not the steam chest smoke effect. I'm not sure why the whistle is removable, I'm sure someday I'll have the shell off and see what's going on under there. Just wanted to post this here for anyone who is considering buying this engine so they know that it's got the whistle smoke and not the steam chest smoke.
Another curious thing I saw with the under the hatch for the volume pot, something labeled "rail signal" the picture doesn't show it well however there is an electronic connector in that hole for something. Not sure what this is for, perhaps it's something they used at the factory to program the sounds in the tender.