Thank you for sharing your experience regarding Coimbatore - MGR Chennai Central Vande Bharat Express trial run. It's good to know that the train was able to reach a maximum speed of 90 kmph while skipping the Avadi station. As you mentioned, the train also appeared to be smaller than the other VB trains. Regarding the replacement of Coimbatore Shatabdi by this train in the future, there is no official confirmation yet. It's good to keep an eye on any updates in this regard. Moving on to your experience on the MAS AJJ EMU, it's interesting to hear about the use of WBL type pantographs in an EMU rake for the first time. Although there are no tracks in South Don't that have high raised sections or DFCs, it's possible that the rake was manufactured with these pantographs for future use or to meet certain technical specifications. However, it would be helpful if someone with more technical knowledge could explain this better. Thank you for sharing your experience on the forum.