Even Mumbai-Pune intercity traffic is also not fully tapped by IR, else there would have been a train every hour between the two cities. Here too longer railroute 192km (road route-160km), railroute is curvy with ghat sections.
A straight rail route (vashi-pune straight ) using longer tunnels could be about 130-150kms with a travel time of just about 1.5hrs with 130/160kmph trains and about 2-2.5 hrs with LHB SF trains.