built by ITD Cementation, a part of Italian-Thai Development Public Company and the other 3 will be built by Afcons including the 520 meters underwater stretch. All the elevated stations will be built by Kolkata based Simplex Infrastructure ltd. Escalators and elevators Ninety escalators and forty elevators are to be installed at different levels in the line to facilitate smooth mobility of passengers including physically challenged & aged persons. LOA for installation of forty-one escalators and twenty-six elevators for 8 nos. stations of Phase-I has been awarded. Tunnel Ventilation System (TVS) TVS shall provide a means to control smoke flow and ensure safe evacuation of passengers in case of fire as well as maintain an acceptable environment in the tunnel and station track way. Tender for the TVS was invited and the bids of eligible tenderers are being evaluated. Platform Screen Doors (PSDs) PSDs are a system of full height/half height motorized sliding doors that provide controlled access to the trains and protect the platform edge. PSD work for 6 elevated and 2 underground stations have been completed. Electrification, Signaling & Automatic Fare Collection The line will have two types of signaling equipment supplied by ANSALDO STS . One will feature cab signaling and continuous automatic train control with automatic train protection. The other signaling equipment will include an integrated system featuring fiber optic cable, SCADA, radios and a PA system. The line will also have a train information system, control telephones and a centralized clock system. Contract for AFC works has been awarded to M/s. Indra Sistemas SA (Spain). Operations Unlike the north–south corridor, the east–west metro will run from 8 am to 8 pm at a frequency of 1.5 minutes during peak hours and 5 minutes during non-peak hours. But in phase 1 operations, the frequency will be 20 minutes, and each will stop for 20 seconds in each station. Rolling stock CAF in collaboration with Melco was to supply 14 trains for this line. The 14 rakes were acquired at a cost of approximately €110m . Each rake will compose of 6 coaches having a capacity of 2068 people per train. The maximum speed of the train will be . The first lot of trains was to be manufactured in Spain and imported to Kolkata in November 2014. The next lot was to be manufactured in India. However, the tender was cancelled by KMRC due to technical