Howrah is difficult to access from East part & North Part of Kolkata. So Sealdah or Chitpur is best option. South India Bound train may come via Bhattanagar , Rajchandrapur, & Dumdum. Then the train crawl 7 km to Sealdah & 4 km to Chitpur. I think it is no problem to cross Hooghly River via Bally Bridge as speed of this CCR section is 90 km per hour & Andul of SER is not far. Rail is intentionally congest Howrah by excess train. I suggest at least 10 trains should be South India from Sealdah division