Bullet train project and pending DFC in Maharastra are due to land acquisition which depend on state govt. Being congress and NCP supported they totally averse to any major Mile stone to central govt as they are not in power. Land acquisition is a big task and cannot be completed in time for any project unless the respective state govt has interest in that project. You are correct that most of the project are furusyic projects of Suresh Prabhu and at the same time execution and providing finances to railway infra is also with central govt. Like in road projects they cannot be executed in BOT, and don't have revenue model for that project to raise external funds line in NHAI.