Sulthan Bathery – Trivandrum – Nedumangad is the longest KSRTC Intra-State Superfast service.  This bus is running 550 km from Bathery to Nedumangad via Trivandrum.  But as per the record of KSRTC, 537 Km is the Trip Distance of this service.  Mananthavady – Trivandrum is the seconed longest Intra-State Superfast service which is covering 541 km one side.