4 Line

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As a railway service 4 Line or Line 4 can refer to the following:

[edit] Public transport

• 4 (New York City Subway service)
• Line 4 Yellow (Montreal Metro)
• Route 4 (Baltimore), a bus route

[edit] Measurement

• A Line is an obsolete unit of measurement equal to 1/10^th of an inch used for example in the measurement of rifle ammunition, 4-Line may refer to a 4 line round and the rifle to fire the round.