Mexican Train Rules

Set a double-12 (or double-9, for smaller groups) domino set on the table with a starting hub piece in the middle, and you've got the two defining features of Mexican Train: a shared "public" train anyone can add to, and a private train each player is racing to empty their hand into first. That mix of shared and private lines is what separates this from ordinary block dominoes, where there's only ever one line of play everyone contributes to together.

Setup

Each round starts by determining the round's "engine" — the double domino matching that round's number (round one uses the double-12, round two the double-11, and so on down through double-0 across thirteen rounds total). The engine goes into the center hub, which has slots for a personal train from each player plus one additional slot for the shared Mexican train. Depending on player count, each player draws a starting hand of 11 to 15 tiles from the shuffled boneyard; any tiles left over stay face down as the draw pile.

Building Trains

On your turn, you may play a tile extending your own train (the end must match the domino at the end of your line, same as ordinary dominoes), extend the shared Mexican train if it's open to everyone, or add to another player's train only if that train is currently marked "public" — which happens automatically if its owner couldn't extend it on their own most recent turn and had to leave it open. If you can't legally play anywhere, you draw one tile from the boneyard; if it's playable, you may play it immediately, and if not, your train becomes public and your turn ends.

Doubles Demand a Follow-Up

Playing a double tile (matching pips on each end, like 6-6) doesn't end your turn the normal way — you must immediately play a second tile onto that double, or draw from the boneyard until you can. If you genuinely can't cover the double after drawing, the double stays open, and any other player can cover it on their own turn before play continues normally past that point. This is the rule new players forget most often, since nothing else in ordinary dominoes works this way.

Ending a Round and Scoring

The round ends the instant one player plays their last tile, or when the boneyard is exhausted and no one at the table has a legal play remaining. Every other player then totals the pip value of whatever tiles are still in their hand (the two sides of each domino added together), and that total is added to their running score for the game. Lower scores are better — Mexican Train is one of the few widely played domino games where the goal is to finish with the least, not the most. After thirteen rounds (double-12 down to double-0), whoever has the lowest cumulative score across every round wins.

Where the Name Actually Comes From

Despite the name, this specific train-based format is a relatively recent American commercial addition to a much older domino tradition rather than a game with documented Mexican roots — most domino historians trace dominoes themselves back through Chinese tile games, carried west and eventually adapted into train-style layouts in the 20th century US, with "Mexican" most likely describing the shared public train rather than the game's actual country of origin. No single inventor or date for the specific train-and-hub format is reliably documented, which is unusual for how widely the game is now played at family tables.

The Arguments This Game Actually Produces

The most common table dispute is whether a player is required to play on the shared Mexican train if they legally can, or whether they can choose to play on their own train instead when both are options — standard rules leave this entirely up to the player's choice, not a requirement. A second common argument is whether a train that's gone public reverts to private once its owner can play on it again (it does, immediately, the moment the owner successfully extends it). Both are settled on the full dispute breakdown; the scoring deep-dive gives a full round-by-round point reference, and a printable score sheet for tracking all thirteen rounds without losing count.

Questions People Still Ask Mid-Game

What happens if two players both need the same double and neither can cover it? The double just stays open on the table; anyone at the table, on their own future turn, can be the one to finally cover it, and play continues normally around it in the meantime.

Can you have more than one train open on the table at once besides your own? Yes — any number of trains can be public simultaneously, and a single tile in your hand might be legally playable onto several of them at once, which is entirely your choice to decide between.

Does the starting hand size really change with player count? Yes — fewer players get more tiles each (a two-player game often deals 15 apiece), since there are fewer trains splitting the same boneyard, and the exact split is usually printed on the set's included rule card.