- Line 4
Line 4 or 4 Line may refer to:
- 4 (New York City Subway service)
- Barcelona Metro line 4, line in the Barcelona Metro network operated by TMB
- Line 4, Beijing Subway, in Beijing, China
- Line 4 (Budapest Metro), fourth line of Budapest Metro
- Line 4, Guangzhou Metro, in Guangzhou, China
- Line 4 (Madrid Metro)
- Line 4 (Naples metro), rapid transit railway line that forms part of the Metropolitana di Napoli
- Line 4 of Saint Petersburg Metro, line of the Saint Petersburg Metro
- Line 4 Yellow (Montreal Metro)
- Mexico City Metro Line 4, a rapid transit line in Mexico City
- Paris Métro Line 4, second busiest metro line serving Paris
- Paris Tramway Line 4, tram-train line just outside the limits of Paris proper
- Rodalies Barcelona line 4, commuter rail in Barcelona metropolitan area, Catalonia, Spain
- Seoul Subway Line 4, long line crossing from the southwest to the northeast across the Seoul National Capital Area
- Shanghai Metro Line 4, loop line in the city of Shanghai, China
- Route 4 (Baltimore), a bus route
- 4-line, obsolete measure in Line (unit)
- 4-line, 12.17x44mm ammunition or a rifle which fires it
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