None Of The Above....
In my view:
Talgo should also run..and Bullet train should also be started in our country. Once these both starts , the RCF should start manufacturing "Make In India" prospective Our own Talgo Coaches and then these coaches should FULLY Replace the Present Shatabdi trains.
Talgo and Bullet are NOT alternative. These both are needed considering our Fast changing...
more... Economy and then , Shatabdis should be replaced with these rakes.