▻ Très vite testé : LEGO 40370 40 Years of LEGO Trains - HOTH BRICKS
Promotional items may be LEGO.com's ace in the hole
Lego 40th anniversary train 40370 comparison with 7810 - YouTube
40370 Steam Engine Promotional Set Review | Brick Model Railroader
LEGO Train 40370 Improved! Compare to 7810! Plus Special Blue Brick! Haul :) - YouTube
Set 40370-1 : Steam Engine {Reissue of Set 7810} [Train] [BrickLink]
BrickLink - Set 40370-1 : LEGO Steam Engine {Reissue of Set 7810} [Train:Promotional] - BrickLink Reference Catalog
I really spent 100$ to get the 40370 freebie engine just to take 4 of its wheels for my modified 71044 Disneyland Engine so the tender could have the red wheels it
Review: 40370 Steam Engine | Brickset: LEGO set guide and database