Double line (disambiguation)
Double line may refer to:
- Double track, a type of railway involving running a track in each direction
- Double line automatic signalling, a form of railway signalling used on the majority of double track sections in New Zealand
- Double-lined mackerel, Grammatorcynus bilineatus, a species of Spanish mackerel
- Double-lined spectroscopic binary, a type of binary star: see Binary star#Types
- Mythimna turca, common name the double line, a moth of the Noctuidae family
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