Train Tracks Clue Numbers Explained: How to Read the Edges
Updated October 3, 2026 · 4 min read
The numbers around the edge are the whole puzzle. Learn to read them well and the rest of Train Tracks is bookkeeping.
What a clue means
Each number counts the squares in its row or column that contain track, not the number of turns and not the length of the longest run. A 3 means exactly three squares in that line hold a piece, wherever they are.
Zero and full
A 0 empties the whole line. A clue equal to the grid width fills it. These are the easiest reads on the board, so do them first.
Open squares versus the number
As you play, compare each clue with two figures: the track already placed in the line, and the squares not yet crossed out. If placed plus open equals the clue, every open square is track. If placed already equals the clue, every remaining open square is empty.
The totals must match
Add the row numbers and you get the railway's length. Add the column numbers and you get the same figure. If your reading of the clues doesn't give equal totals, you've misread one.
Small numbers, big information
A 1 tells you the line passes through that row or column in exactly one square. A 2 on a 9-wide line is nearly as strong. Small clues limit where the track can go far more than large ones, so work the small numbers hardest.