Additions:
- u-bahn tracks can be used inside the grid, where they work like in [Pipelink]


## [u-bahn] Puzzles
### Newest submissions

W=8x8&L=x0x1(1)x1x1x1x1x1x1(2)x1x1(2)x1(2)x1x1x1x1x1x1(4)x1x1x1x1x1x1x1(2)x1x1x1x1x1x1x1x1x5(1)x1x1x1x5x1(2)x1(1)x1x5x1(3)x1x1(2)x5(2)x1x1x1&L-AD=u7u14&L-AL=u7u7u14&L-AR=u7u7&L-AU=u7u7u7u7&SS=34RDDRUUU9DR5RUUULLLDDDR&G=u-bahn&A=Pedro&T=example&F=1&D=2024-10-15

### @JustKirb
W=14x14&L=x0(6)x1x1x1x1x1x1x1x1(6)x1x1x1x1x1(0)x1x1(0)x1x1(0)x1x1(0)x1x1(0)x1x1(0)x1x1x1x1(0)x1x1(0)x1x1(0)x1x1(0)x1x1(0)x1x1(0)x1x1x1x1(0)x12(0)x1x1x2x2x2x2x2x2x1(4)x1(0)x12(0)x1x1x2x2x2x2x2x2x1(2)x1(0)x12(0)x1x1x2x2x2x2x2x2x1(2)x1(0)x12(0)x1x1x2x2x2x2x2x2x1(4)x1(0)x12(0)x1x1x2x2x2x2x2x2x1x1(0)x12(0)x1x1&L-AD=u13u26&L-AL=u26u13&L-AR=u26u13&L-AU=u13u13u13&G=u-bahn&A=justkirb&D=2024-10-16&F=1&N=422466&T=Castle_Trains

### @PinkHoodie
W=9x9&L=x0(0)x1x1x1x1x1x1x1x1(1)x1x1x1x1(1)x1x1x1x1x1(1)x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x6x1x1x1(0)x6(0)x1(3)x1(0)x1x6x1x1(1)x1x6(2)x1x1x1(2)x6x1x1x1&L-AD=u8u8&L-AL=u8u16u8&L-AR=u8u8u8&L-AU=u8u8u16&SS=38RRUURRDDLDDLLLUU7UU1RURUU&G=u-bahn&A=PinkHoodie&D=2024-10-22&F=3&T=Ground_Branch
W=20x10&L=x0x1(1)x1x1(1)x1x1x1x1x1x1x1x1x1x1x1(3)x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1x1(2)x7(1)x1(1)x1x1x7(2)x1(0)x1(2)x1(1)x7x1x1x1(5)x7x1x1x1x7(1)x1x1(2)x1(2)x7(0)x1(0)x1x1(0)x7x1(0)x1(0)x1(0)x7(0)x1x1(2)x1(0)x7(0)x1x1(2)x1(0)x7x1(0)x1(0)x1(2)x7(2)x1(0)x1x1x7(1)x1x1(3)x1(5)x7x1x1x1(4)x7x1x1x1x7(0)x1(2)x1(2)x1(2)x7(2)x1(1)x1x1&L-AD=u9u9u9&L-AL=u9&L-AR=u9u9u18&L-AU=u9u9u9u9&SS=41RRURURDRURRULLDLUULLLDDLDDDRUUURD22U2DRU6DRUL43RDRRRRDRRDLDRURUUUULDDR6ULLLDRRUU2RRDLLUULDLLDLU2RRRRULDDDDDRULLDLLL41RDR17ULU&G=u-bahn&A=PinkHoodie&D=2025-03-30&F=5&O=Enigmarch_2025&T=Route_on_the_Rail_16x6


## Variants

### ´´dead-end´´
V=dead-end
W=10x10&L=x0x1(1)x1x1x1x1x1x1x1x1x1(0)x1x1x1(1)x1x1x1x1x1x1(0)x1x1x1x1(0)x1x1x1x1x1x1x1(2)x1x1(1)x1x1x1x1x1x1x1x1x1x1(1)x1x1Xx1x1x1x1x1x6x1(1)x1(0)x1x1(1)x6x1x1x1(2)x1x6(0)x1x1x1x1x6x1x1x1(1)x1(0)x6x1x1x1x1&L-AD=u9u9u9&L-AL=u9&L-AR=u9u9u9u9&L-AU=u9u9&SS=54RDDLD7URULL3RR16ULU10ULURUU&G=u-bahn&V=dead-end&A=PinkHoodie&D=2025-05-03&F=2&O=Dead_Ends_and_Empty_Clues&T=Zero_to_Four

TBA


## Acknowledgements and Changes
**2024-10-15** Thanks for @JustKirb for testing an example puzzle and sending another for rollout!
**2024-10-22** @PinkHoodie made the [rule panels|../panels] for [U-bahn], the cover picture, a puzzle for rollout, and gathered metadata on this genre. Thank you!
**2024-11-05** Local variant ´´dead-end´´ was added to [u-bahn], and idea by @Paletron.
**2025-03-30** Additional aux marks were added, a suggestion by @PinkHoodie. Thank you!
**2025-04-04** :::puzzletters @PinkHoodie composed 1 [u-bahn] (classic) puzzle, 16x6!
**2025-05-03** The base genre [u-bahn] has been extended to include "empty" tile cross marks, so now clues can track unoccupied tiles as well. Thanks @PinkHoodie for suggesting the inclusion, which appeared in a puzzle by @KNT