| skos:altLabel | - signals
- Signals
- absolute signal
- disc signals
- position light signals
- searchlight signals
- North American railroad signal
- North American railroad signals#Hall disc signals
- color light signals
- color position light
- large wooden ball
- line-side signal
- re-signalled
- searchlight signal
- searchlight-style signal
- signal in North America
- vertical color light signals
- North American railroad signals#Distant (approach) signals
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