Priyesh K. P
Rolling Stock Expert, Systra

Rolling Stock is an important asset and proper planning is required in selecting the design and the type of Rolling Stock. There are a variety of Semi- High Speed and High-Speed rolling stock series in the world. Specifications of rolling stock are dependent not only on technological factors but also on the geographical conditions where the train is operated. In deciding the type of rolling stock, due consideration has to be given to the operational requirements, interface with infrastructure, whole life cost, as well as the client’s aspirations and the compatibility of the rolling stock with that of other SHSR and HSR corridors.

EMU (Electric Multiple Unit) trains with driving facilities on both end of the train, is recommended for Silver Line Corridor because of the inherent advantages like better operating parameters, reduced travel time, faster acceleration and deceleration, better adhesion, reduced axle load, more suited for regenerative braking, higher Energy Efficiency etc. In addition, it will enable full use of the floor area of a train for passengers, and thus increase the transportation efficiency and would bring down the cost.

Based on the traffic demand forecasted, it is proposed to begin the initial commercial services with train set of a 9 (nine) car configuration, which consists of six motor cars and three trailer cars with the approximate Passenger capacity to be around 675. Train length can be increased up to 12/15 cars in future. Space must be earmarked for service area, pantry, luggage, toilets etc. in each car, thereby reduction in paid area per car.

Latest Technological parameters are being proposed for the Rolling Stock of Silver Line. Aluminium alloy-based car body is proposed. Each car will have two bogies (Bo-Bo configuration) with primary and secondary suspensions.

The interior will have modern state of art design to provide at most comfort to the passengers with luggage racks, toilets, reclining and rotating seats. Facilities for persons with reduced mobility are also proposed.

The propulsion system is VVVF based with asynchronous motors/PMSM. The brake system proposed is a blended braking system with predominate usage of regenerative brake system and supplementary usage of pneumatic brake system. The pneumatic brake system may be disc/tread or mixture of disc and tread. Two doors per side of each car is proposed for the train. These doors will function as emergency doors during the emergency evacuation. To maintain the inside temperature of the saloon and cab, roof mounted HVAC is proposed. Modern type of communication system and entertainment system will be available in the Rolling Stock which can be used in emergency conditions also.

For train operations beyond 160 kmph, it is necessary to improve the safety level & to ensure the safety of train movements. Overlooking a wayside signal may cause a serious accident when trains run at more than 200 kmph. Since it is not possible for the driver to continuously watch the line side signals and the response time of Signalling & Train Control System becomes important for speeds above 160 kmph, the Cab signalling system is essential for high speed rail at 200 kmph. The Cab Signalling System will provide full and complete in-cab information to the driver to permit interpretation of signalling and permitted speed conditions together with a direct link to the train braking system to automatically enforce train braking in the event of excess speed. The Cab Signalling System is designed and configured to permit smooth and efficient service braking applications. Detection of irregular wrong direction movement of a Train set by the Cab Signalling System is required and shall result in an emergency brake application and associated alarm being given to the driver.


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