heritage of sports in the state. The monsoon season forms the theme of the Kaloor station. Endangered species and animals of Western Ghats are depicted in MG Road station, and the history and trade routes of Kochi are the theme of the Maharaja's College station. Stations were designed to provide the maximum natural ventilation in passenger areas. All stations utilize LED lighting and have water efficient fittings in toilets. Some stations also provide facilities for rainwater harvesting. A three-second tune composed by Bijibal will be played whenever train doors open or close at stations. The tune features traditional sounds of Kerala music featuring a chenda and ilathalam. KMRL chose to play the tune instead of the typical chime played on other metros in the country in order to give "Malayali flavour" to the metro system. List Infrastructure Rolling stock The Kochi Metro uses 65-metre long Metropolis train sets built and designed by Alstom. Coaches are to be tall, and each train of three coaches will be in length. Each coach will have three wide doors, with automatic door closing and opening. The platforms at each station will be long, and will have half platform screen doors. A total of 22 trains will be inducted for the first phase of operations of the metro. The axle load is for which the structures are to be designed. The capacity of each train is 975 passengers. It was initially proposed to use maglev trains from South Korea for Kochi Metro. It was later decided that Kochi Metro will run on standard gauge, with 3 coaches initially in each train, which can be extended to six coaches in future. The width of each coach was initially fixed at in the DMRC's original DPR. However, KMRL wanted the metro to be as a medium metro corridor, as opposed to a light one, and the width was increased to . The DMRC floated an initial global tender in July 2013 for the manufacture and design of the coaches. Hyundai Rotem/BEML and Band Changchun Railway Vehicle Co Ltd were the only bidders when the bids were opened in December 2013. The Chinese firm did not qualify, leaving only the HYUNDAI consortium in contention. The contract was re-tendered on 10 March 2014, and the coach width requirement was changed. The DMRC opposed re-tendering, stating that it might delay the metro's opening, by up to a year or more.