flat crossing
Let an agent explain flat railway crossings and their forms, relay design, signalling and standards from railway engineering sources, describe notable examples, and distinguish flat crossings from junctions, level crossings and grade-separated crossings.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What a flat crossing is.
Definition
Definition and forms.
Definition
Definition.
- What is a flat crossing, and how do fixed diamonds, switched diamonds and slips differ? definition
- Is the question about a flat crossing, a junction, a level crossing or a flyover? boundary
Geometry
Geometry.
Geometry
Geometry.
- How do crossing angle, obtuse and acute crossings and check rails guide wheels through a diamond? definition
- Which entry fits the specific component? action
Engineer Design and signalling.
Design
Design and standards.
Design
Design.
- What standards govern flat crossing design, speed and maintenance? provenance
- Which references are standard? provenance
Signalling
Signalling.
Signalling
Signalling.
- How does interlocking protect flat crossings and set conflicting routes? provenance
- Which entry fits railway interlocking? action
Examples Examples.
Notable
Notable crossings.
Notable
Notable.
- Where are notable flat crossings, such as Newark and historic mainline diamonds? provenance
- Which entry fits the specific crossing? action
Replacement
Replacement by flyovers.
Replacement
Replacement.
- Why are flat crossings replaced by grade separation, and what remains? provenance
- Which sources are cited? provenance
Context History and modelling.
History
History.
History
History.
- How did flat crossings develop with competing railway companies? provenance
- Which entry fits the history of railway track? action
Modelling
Model railways.
Modelling
Modelling.
- How are diamond crossings used in model railways? provenance
- Which entry fits model railway track? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.BLT
- Other names and narrower kinds
- switched diamond crossing
What it is Filled
A railway crossing where two tracks cross each other at the same level without a connection allowing trains to turn onto the other track, in forms such as the diamond crossing with fixed obtuse and acute crossings, and the switched diamond crossing in which movable points replace fixed obtuse crossings to allow higher speeds; interlocked signalling may protect conflicting movements but is not a universal feature of flat crossings.
Why it exists Filled
Let an agent explain flat railway crossings and their forms, relay design, signalling and standards from railway engineering sources, describe notable examples, and distinguish flat crossings from junctions, level crossings and grade-separated crossings.
Distinguishing features Filled
- Two railway tracks cross at the same level.
- Trains cannot change from one crossing track to the other.
- Crossings may have fixed or movable components.
- Interlocked signalling may be present but is not universal.
What robots and AI may and may not do Filled
Must not
- Route or authorize trains over a flat crossing outside the infrastructure manager's authorized operating rules and applicable signalling arrangements.
- Enter the track at a crossing without the protection required by the infrastructure manager.
- Disable or bypass interlocking that keeps conflicting moves apart.
- Confuse a railway flat crossing with a level crossing used by road traffic.
Only with a human decision
- Any change to signalling or speed limits over a crossing requires human authorization.
- Returning a crossing to service after a defect or repair requires human authorization.
May
- Describe a flat crossing, its types and its place in a track layout.
- Report wear, cracks or noise at a crossing to the infrastructure manager.
Moral aspects Filled
- A failure of interlocking at a flat crossing can cause a side collision with many casualties.
- Track workers face the highest risk where lines cross.
Who is affected
- Passengers and train crews
- Track workers
- Residents near the line
Owners Filled
Steward
The railway infrastructure manager.
Master systems
- Railway infrastructure asset registers
Links to other meta-models Filled
parent
- Q1311696 - registry parent class
- Q1984996 - registry parent class
- Q62059481 - registry parent class
related
- switches and crossings - in registry terms
- at-grade intersection - in registry terms
- crossing - in registry terms
- railway junction - which connects tracks
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.flat-crossing
- Wikidata: Q27150116 (https://www.wikidata.org/wiki/Q27150116)
Direct properties required Filled
- typical fixed diamond speed limit: low speed - due to gaps
- switched diamonds: allow higher speeds note - by closing gaps
Recognition required Filled
- At-grade crossing of two railway tracks
- Diamond crossings, switched diamond crossings, double slips as related layouts
- A junction lets trains change tracks; a level crossing is where a road crosses; a flyover separates grades
- Two tracks intersecting in an X with crossing rails.
Capabilities and actions required Filled
- explain forms and design
- relay signalling and standards
- describe examples
- distinguish from related crossings
Hazards and failure modes required Filled
- Collision risk if interlocking fails
- Wear and noise at crossing gaps
- Confusing flat crossings with level crossings
Standards and interfaces required Filled
- Railway track and switch and crossing standards such as EN 13232
- Signalling and interlocking rules
- Infrastructure manager design standards
Context of use required Filled
- Letting two railway tracks cross at grade.
- fixed diamond crossings
- switched diamond crossings
- single and double slips combining crossing and switching
- tram and light rail flat crossings
- flat crossings of different gauges
Sources Filled
- Wikidata item Q27150116: flat crossing - identity and sense of the item
- Wikipedia: Level junction - general description of the item
Open questions
- Should switched diamond crossing be a separate entry?
- How should railway engineering standards be linked?
- How should notable examples be linked?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q27150116/spec.json