Why used three railway track in Bangladesh | Dual Gauge

भारत में 2 लेकिन बांग्लादेश में 3 रेलवे ट्रैक क्यों है?
Why used three railway track in bangladesh?
broad gauge
metre gauge
narrow gauge
standard gauge
types of railway lines
#Bangladesh_Railway
#Indian_Railway
#Dual_Gauge_In_Bangladesh
#Indian_Railway_Vs_BanglaDesh_Railway
#Highet_Speed_Train
#Train
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