Railways can consider Tejas/VB from NZM to MMCT as rail traffic is less now and considering speed of 160 kmph the distance can be covered in 8hrs and 30mins approx with halts at Kota, Ratlam, Vadodara and Borivali. This seems practical and would generate revenue as Delhi to Mumbai by air also takes roughly around 5-6hrs (airport to airport only) because of pre departure and post arrival covid protocols.