Circular railway is a part of eastern railway , sealdah division..
It is circlely round the kolkata..
The route starts at kolkata bimabandar (dumdum airport ) & ends at Dumdum jn., via dumdum jn , kolkata chitpur , bbd bag , majherhat , ballygunje , sir gurudas banerjee halt , bidhannagar road .
Before 2000 , only some stream trains runs from Dumdum jn...
more... to Princep ghat .
.
After extention & electification the emu trains runs from this route..