This lack of re-adjusted parking spaces is one of the main reasons for not converting all Harbour line trains to 12-coaches at once but in phases. The first phase will see services from a station which is equipped to park 12-coach trains.The space for parking of a train plays a key role in making trains available for service. In the morning we have designed the timetable according to each station’s parking capacity or vice-a-versa and then remove the trains one by one. Similarly, even if the other work related to the increase of the number of coaches such as increasing the length of the platform and importantly, getting the extra coaches needed is completed, the work will be wasted if there is no parking space for these trains.. Even if we get the coaches from Western Railway and the length of platforms are increased, but if we cannot park all the trains, we cannot start the 12-coach services,” added the official. "In the four hours when the suburban trains do not operate, these trains are here.