Train Track Logic Puzzles

1. Draw one railway from the green arrow to the red arrow.
2. Each number shows how many squares in that row or column hold track.
3. Track goes straight or turns a corner. It never branches, crosses itself or goes diagonal.
4. Some pieces are already placed. They count too.

Controls: drag from square to square to lay track, and drag back to take it away. Tap an empty square to mark an X. Tap a piece of track to clear it.