LEGO 40370 Steam Engine is a Promotional set currently valued at $35 for new and sealed sets. The set retired in March 2020 with annual appreciation averaging 29.95% since. On the used market, values range from $23 to $50 based on condition. Secondary market prices for new and sealed sets typically fall between $34 and $38.
LEGO 40370 Steam Engine is a Promotional Gift with Purchase set released in 2020, containing 188 pieces and 1 minifigure. It was offered as a free item with qualifying purchases at LEGO Stores and on LEGO.com. The build is a near reissue of the 1980 Push-Along Steam Engine (7810), updated with modern elements such as red train wheels and redesigned train bases replacing retired parts. It includes a display stand with transparent supports, rocker hinges, a “40 Years” train logo and nameplate, and a vintage-style train conductor minifigure with a classic blue torso, plain blue legs, red cap, and standard smile.
A new and sealed Steam Engine is currently valued at around $35. The average used price is $27 for those in good overall condition. Based on current trends, this set could be valued near $37 within the next year. The 1 included minifig account for approximately 15% of the set's total value.