Raptisagar was earlier a good option for passengers between Palakkad-Ernakulam till the time PGT-ERS MEMU started. Ideally it can be easily speeded up. Takes almost 4 hours between these 2 stations even though it is superfast (30-40 wait at SRR) The charge in Sl class is about Rs 120-130.
Just 40 kin prior there is a MEMU which also takes 4 hours and one can travel in just Rs 30-Rs 35 !!!! . Too many stoppages between Palakkad-Ernakulam stretch for a superfast train is actually not needed