Very much similar to the Kollam - Sengottai and Sengottai - Tirunelveli Passenger which runs as a single train with 2 different train no s ...... I think Kollam - Alappuzha Passenger reaching Alappuzha continues its journey to Ernakulam as Alappuzha - Ernakulam Passenger......the return Alappuzha - Kollam Passenger comes from Ernakulam as Ernakulam - Alappuzha Passenger and proceeds....so why arent they making these two to run with single train no s ??