Level junction
（重定向自Diamond crossing）
![Flat junction: trains have to wait to cross the 'diamond' at the centerA schematic diagram of a dual-gauge diamond crossingSeveral diamond crossings (now obsolete after removal of one track direction) in the Port of Mainz, GermanyA fully assembled level junction used where the Union Pacific and Kansas & Oklahoma tracks cross](/Images/godic/202501/08/Flat-junction-both-tracks.svg1629.png")
![](/Images/godic/202501/08/Diamond_Crossing_Dual_Gauge_Double_Line1629.png")
![](/Images/godic/202501/08/Railway_Tracks_Near_Mainz_Port1629.jpg")
![](/Images/godic/202501/08/Diamondcrossing1629.jpg")
A level junction (or in the United Kingdom a flat crossing) is a railway junction that has a track configuration in which merging or crossing railroad lines provide track connections with each other that require trains to cross over in front of opposing traffic at grade (i.e. on the level).