After Development of Ujjain Station, it should be connected with Vande Bharat train from New Delhi or Hazrat Nizamuddin and Mumbai. It is roughly 700-750 Kms on main line on both routes. VB Trains could be -
Bandra Terminus - Borivali - Vadodra - Surat - Ujjain
New Delhi / Hazrat Nizamuddin - Mathura - Kota - Ujjain - Indore