Use this set with the 10874 Steam Train or 10875 Cargo Train to extend the possibilities of your LEGO DUPLO train collection. We restrict the purchase limit available to a single household to ensure fairness for all of our fans. I will note that the fit is just a tad snug, causing a slight lifting of the Duplo track, but if it were attached to a baseplate then it would stay flat.

To summarize, we can give each piece a list of 4 numbers, and the pieces form a loop only if summing the pieces' numbers with each other result in a list of four zeros. In fact this condition is sufficient but not necessary (consider a triangle made of 3 straight pieces with 4 curves between each). Also, a 180-degree rotation just negates the coordinates, so we can get away with only calculating the first half of the table.

Only reviews that feature the label "Verified Review" have been checked to ensure that the author actually used or purchased the product. However, as a father, I also don't want broken duplo pieces, so I wanted to make sure the track is not under too much tension. That might not exactly fit baseplate geometry, but it probably works fine sitting loose on the floor. Also includes a LEGO DUPLO construction worker figure, 2 loose bricks, a spade and a suitcase to extend the role-play and story-telling fun.

The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products. Product 1: Use this set with the 10874 Steam Train or 10875 Cargo Train to extend the possibilities of your LEGO DUPLO train collection. To regain access, please make sure that cookies and JavaScript are enabled before reloading the page. It wasn’t until 1947 that they started producing plastic toys, with the first version of the now infamous interlocking bricks coming in 1949.Safety Information: Please remove all packaging attachments, and any other components which are not a part of the toy, before giving this product to a child. Half track sections open up many other possibilities for layouts on their own, regardless of whether new switches exist. Etsy’s 100% renewable electricity commitment includes the electricity used by the data centres that host Etsy. No combination of fewer than 5 pieces will complete the loop, however the following combination of 5 will: 3-4 3-4 1-1 8-8 11-11.

Reddit and its partners use cookies and similar technologies to provide you with a better experience. I don't know why I didn't notice this before - the 'new' style Duplo curved track fits exactly inside the radius of the standard LEGO train track!Preschoolers will also love to place the red action brick on the track and make any compatible DUPLO train (including 10874 Steam Train or 10875 Cargo Train) stop when it reaches it. There are 3 more combinations of 5 that give the correct displacement, but would add an odd number of curves and therefore cause angular misalignment. Therefore we can treat our 2-d vectors of (possibly) irrational numbers as a 2 × 2 = 4-d vector of fractions. However, with brute force you could put 13 curved rails in a circle, but the track would be under too much tension, and it's probably not good for the duplo pieces. Note that instead of adding a piece we can remove its 180-degree rotation, so instead of adding 3-4 and 11-11 we can remove a 9-10 and 5-5.