Logic Masters Deutschland e.V.

A new sudoku railway system has been installed in the city. The line has 7 stops, numbered 1 through 7. Cells with a stop are shaded blue, and the stop's number is the same as the cell's digit.

The number of a stop is also the number of cells touching the stop (either orthoganally or diagonally adjacent) which are part of the track. The stops themselves are not considered part of the track.

The train starts on the track cell that touches stop 1, and goes along the grid visiting each stop in order (so the train track does not go to a cell that touches stop 7 before going to at least one cell touching stop 6). The train goes through the entire city, such that all 2x2 regions in the grid have at least 1 track cell. The train's path along the track doesn't touch itself, even diagonally. The train track may continue past the 7th cell that touches the 7th stop, but there is an end to the track (i.e the track has a start and an end, and does not form a single continuous loop)

The only downside to this great new transit system, is that it required demolishing several skyscrapers to make way for the track. Clues outside the grid are regular skyscraper clues, except the height of any cells along the track is 0. Track cells can be part of a skyscraper clue's count, though only the first seen track cell will ever be counted (e.g. a row of 9 track cells would have a skyscraper clue of 1). Since as above, train stops are not part of the track, train stop cells have a normal skyscraper height.

For safety, a few level crossings (thermometers) have been installed as well. These act as normal thermometers, and their placement on/off the track is to be determined by the solver