A railway line must run from the station at A, on the left edge, to the station at B, on the bottom edge. It travels through the middle of squares, going straight or turning a corner, and never crosses or touches itself in a loop.
The numbers along the top and right say how many squares in each column and row the track passes through. A few pieces of track are already laid.
Start with rows and columns of 0 or full lines, then extend the given pieces: every track square joins exactly two of its neighbours.
Lay a single railway line from A to B through the squares, matching the row and column counts.
The full guide, with a worked example and common mistakes: How to play Train Tracks.
It can pass next to itself, but it never crosses, branches or joins into a loop.
Yes — a given piece is a track square and counts towards its row and column.
Yes — every puzzle here is checked to have exactly one solution.
Open the Train Tracks Solver, type the counts, set A and B, add the given pieces and press Solve.