All I can say is DAT sometimes politics is given more importance than TG he business in case of railways.....u can see DAT 12443 is bypassed at GMO rather Than being commercially halted...15021 and 22587 are trains dat already cover a long distance in coming from Kolkata to gomoh ( both the trains take almost 8 hrs while normal route trains take 4 hrs)so they might be diverted away from bksc to save time