recently Mr Vivek has asked abt the conusion abt the ERS loco reversal na? so hope this will help u... U can see the main line straight one.. it is the NDLS TVC via allappy line.. now on the left is the ERN and to the right is the ERS. Now Imagine kerala express to tvc via Kottayam. It reaches ERS and changes its loco and goes through the bent on the right.. Sabari Express which does not go to ERS no need to change the loco will take the bent through the Left bend.. Netravati express via allappuzha will go straight... At kayamkulam Jn the Kottayam route as well as the Allapuzha route merges together... hope u got it now...