MRT Line 4 may refer to:
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MRT Line 4 (Metro Manila)
The Metro Rail Transit Line 4 (MRT-4) is a proposed rapid transit line that would serve the Greater Manila Area of the Philippines. The , 10-station elevated railway would connect Ortigas Center in Metro Manila and the suburban municipality of ...
, a rapid transit line in Manila, Philippines
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MRT Line 4 (Dhaka Metro Rail), a mass rapid transit line in Dhaka, Bangladesh
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