What the Doors Closed / Interlock symbol means
Door interlock systems verify closure and locking before departure.
Where you may see this symbol
This entry belongs to the Rail section and is grouped under Doors. It is commonly encountered at Driver desk / train management system. Depending on the vehicle, vessel or machine, it may appear as a lamp, display message, annunciator or control-panel symbol.
How this symbol usually looks
Blue/green/white conventions vary; some systems show side-selective indications.
Common versions you may see
The examples below show a few realistic ways this symbol may appear. Exact geometry, wording, framing and flashing behaviour can vary by manufacturer and system design.
Primary reference
Primary reference appearance for this symbol or indicator.
Display / text variant
Displays may use abbreviations, labels or annunciator tiles instead of an isolated pictogram.
System-state variant
Colour, flash pattern or status wording may change with system state.
Detailed explanation and operating context
Doors Closed / Interlock is indexed on SymbolDeck so users can find it by a specific symbol name or by plain-language searches such as “what does this warning light mean?” The page is designed to help with fast visual identification while still giving enough context to understand the system behind the symbol.
Status is SymbolDeck’s general-reference urgency classification for this entry. Real-world urgency can change with operating state, multiple simultaneous warnings, environmental conditions and manufacturer logic. Approved documentation should always take precedence.
Safety note
For safety-critical road, aviation, marine, rail or machinery operation, this page is for identification and learning only. Approved manuals, checklists, rulebooks, placards and qualified personnel take precedence.
