Is Bigjigs compatible with BRIO? Yes, with one thing to check
Yes. Bigjigs Rail wooden railway is made to fit the other major wooden railway brands, and in practice it does: the pegs and sockets are the same family, the track is the same 40 mm wide, the grooves sit the same distance apart, and a train runs from a Bigjigs straight onto a BRIO one without noticing the joint. The part no source will tell you is the radius of the Bigjigs curve, and that is the one number that decides whether a loop closes.
What matches
| Measurement | Bigjigs Rail | BRIO |
|---|---|---|
| Track width | 40 mm, on Bigjigs’ own listing | 40 mm |
| Track thickness | 12 mm on the listing; 10 mm turns up in callipers accounts | 12 mm |
| Long straight | 215 mm | 216 mm, the long straight D |
| Groove profile | 3 mm deep, 5 mm wide, 20 mm apart | the same, by the one source that measured across brands |
| Connector | peg and socket, sold as fitting the major brands | peg and socket on a 12 mm neck |
| Curved points | 160 mm long | the curved switch is a 144 mm straight with a curve grafted on |
| Curve angle | not published anywhere | 45 degrees, eight to a circle |
| Curve radius | not published anywhere | 182 mm inside, 202 mm centreline, 222 mm outside |
The millimetre that does not matter
Bigjigs’ long straight is 215 mm and BRIO’s is 216 mm. On paper that is a mismatch; in the box it is nothing, because a BRIO joint is built to stretch. BRIO’s pegs are smaller than its holes on purpose, which the company calls the Vario System, and a joint will absorb two or three millimetres without complaint. One millimetre in a straight disappears into the first joint it meets. How the Vario System works.
The number that does matter, and is missing
No Bigjigs page, retail listing or 3D-printing community source gives the radius or the angle of the Bigjigs curve. Not even a plain “same as BRIO” claim for the curve on its own: the compatibility wording on the packaging and in the Amazon titles is about brands fitting together, which is a statement about connectors rather than about geometry.
That gap matters because connectors and geometry come apart. J’adore, the own-brand track Rossmann sells in Germany, uses the same 45 degree curve and the same connector family as BRIO, and its curves have an inner radius of 86 mm against BRIO’s 182. A J’adore curve plugs into a BRIO straight perfectly and then sends the line round a turn less than half the size, so the loop never comes back to meet itself. Nothing suggests Bigjigs is anywhere near that far out, and its straights line up to the millimetre, but it is why “it plugs in” and “it closes” are two different answers.
What to do with a box of both
- Mix the straights freely. 215 and 216 mm are the same piece as far as a layout is concerned.
- Build each turn out of curves from one brand. Eight BRIO curves make a circle; eight Bigjigs curves very probably do too, but if the radii differ at all, a turn with both in it is where the error shows up.
- Check the last joint before you trust a plan. Two ends that meet within about 3 mm will go together; more than that and something has to give.
- Count Bigjigs pieces as BRIO in the planner. That is what it assumes, and the straights justify it.
If you own a tape measure
The missing figure is one measurement away. Lay eight Bigjigs curves into a circle and measure across the outside. BRIO’s comes to 444 mm. If yours does too, within a few millimetres, the two are interchangeable inside a loop and this page could say so with a number behind it instead of an inference.
The other brands
- IKEA LILLABO — the large curves fit, the short ones are a trap, and the pegs jam.
- Hape — sold as compatible, measured by nobody.
- Thomas Wooden Railway — depends entirely on which Thomas track you have.
- Every brand side by side — the whole sheet, including what is a different system altogether.