LEGO 3736 Blue Train Doors with Panes is a Bulk Bricks set from 2000 valued at $19 for new and sealed sets, up 178% from an original retail price of $6.99. Annual appreciation has averaged 4.14% since release. Used copies are valued between $16 and $18 depending on condition. Secondary market prices for new and sealed sets typically fall between $19 and $24.
LEGO 3736 Blue Train Doors with Panes is a Bulk Bricks Trains parts pack released in 2000, containing 20 pieces. The assortment includes 5 blue left train doors (part 4181), 5 blue right train doors (part 4182), and 10 trans-clear door panes (part 4183). The elements are the 1 x 4 x 5 train door style with thin lower support and matching glazed inserts. It was designed for builders to replace or expand doors on LEGO train cars within the system of that era.
A new and sealed Blue Train Doors with Panes is currently valued at around $19, with annual growth of approximately 3%, which is lower than other Trains sets. The average used price is $16 for those in good overall condition. Based on current trends, this set could be valued near $20 within the next year. New and sealed listings currently range from $18 to $24.