Level junction
crossing of two rail tracks without grade separation and without possibility to switch between straight passing and turning to the other track
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).
The cross-over structure is sometimes called a diamond junction or diamond crossing in reference to the diamond-shaped center. The two tracks need not necessarily be of the same gauge.
A diamond crossing is also used as a component of a double junction, like the one illustrated on the right.
The opposite of a level junction is a flying junction, where individual tracks rise or fall to pass over or under other tracks.
Risks
Conflicting routes must be controlled by interlocked signals to prevent collisions.
Level junctions, particularly those of fine angles or near right angles, create derailment risks and impose speed restrictions. The former can occur as the flanges of the wheels are momentarily unsupported and unguided and can slip through the gaps in the rails, and the latter because the assembly contains elements that can break or vibrate loose.
Level junctions are considered a maintenance issue by railroad companies as the inherent gaps tend to be hard on locomotive and rolling stock wheelsets.
This brief starts where responsible research should: with the source description of “Level junction” as crossing of two rail tracks without grade separation and without possibility to switch between straight passing and turning to the other track. Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the general reference register because the source frames it as crossing of two rail tracks without grade separation and without possibility to switch between straight passing and turning to the other track. Its deeper value depends on whether names, dates, institutions and citations support that framing.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Jul 7, 2026. The linked authority identifier is Q27150116. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Level junction” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.