** T-20 was planned to be sleeper version of VB which was originally labelled as T-18 based on their year of introduction i.e. 2018.
** T-18 has introduced good concepts of modern European High Speed Trains like:
- better interiors - better feel
- aerodynamic profile- energy saving esp. for high-speed travel, aesthetics
-...
more... trainset rakes. - faster acceleration/deceleration & lesser travel time etc
** Some extremely important high tech concepts which are more important than above positives of VB, have been left out like:
- aluminium body construction- ultralight coaches facilitate higher operating speed, lesser journey time and lesser energy consumption in addition to durability and longer life.
- Tilting mechanism to enable trains to travel at much higher speeds at curves, leading to a substantial reduction in running time at curves