Chittagong is as large as some Indian cities,and suburban rail serves the city & its suburbs - size of the country doesn't matter here.
BTW,give me a source for the 20 train-sets figure
"Fourteen DEMUs have been imported from China, and six more will soon arrive by June, according to the railway sources."
Commuter train DEMU starts in Chittagong - Click Ittefaq | Click Ittefaq
^The news is from May 2013
In 2014, one more was launched for the Chittagong University.
News Details
Four more have been launched this year on two different routes.
DEMU train service on Ctg-Hathazari route begins
DEMU trains launched on Chittagong, Nazirhat route | theindependentbd.com
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