MRT Line 4 may refer to:
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MRT Line 4 (Metro Manila)
The Metro Rail Transit Line 4, also known as MRT Line 4, is an approved mass rapid transit line to be built in Metro Manila and Rizal in the Philippines.
When completed, it will be the second rapid transit line serving the province of Rizal af ...
, a rapid transit line in Manila, Philippines
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MRT Line 4 (Dhaka Metro), a mass rapid transit line in Dhaka, Bangladesh
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