Very small changes were made in insulation ,material etc
Dekhne me to Sab same lagta hai
Normal Bhopal Shatabdi was also running at 160kmph in early days
Anyways Gatimaan and Mahamana was publicity stunt by govt. The coaches were similar to presently used coaches with hardly 10% difference.
Aur...
more... Abhi jo Tejas Humsafar aa rahi hai uske bhi koi major change nahi hai
Just 1-2 new additions , new exterior and lot of publicity = Humsafar and Tejas