/train/16832/5/439 is small train & still reverse @ Durgapur!!
UDL got 6 PF as compared to 5 PF @ DGP & if long train can stop, they simply can reverse from there (UDL got Loco Shed and is a Jn & can easily manage reversal & major Freight Reversal must be happening there)!!
DGP is a major town, just 16 Kms away from UDL, tough to avoid and hence reversal happens @ DGP!!