Here is an explanation
Let’s take an example travel between Pune and Mumbai distance of 160kms, there are 30 trains each train takes around 800 passengers. Number of buses are 300 per day so and each bus taking 30 passengers now if you calculate the total one-way traffic it comes to around 33,000 passengers.
Consider these passengers now want to travel in Hyperloop transport system. As you see even if let’s say half the travellers decide to travel in hyperloop the system it will need to board one passenger every 5 seconds. Considering the safety aspects and am guessing there is some distance between two hyperloop pods it’s not going enough with one track and thus increase the investments or less number of travelers can travel.
More feasibility study in terms of capacity planning and its affordability is needed.