Constructing bullet rails in just 5 years? Really Bro?
That's not so easy.Tenders has to be submitted,R&D has to be done for area,ticket price and budget etc etc.They has to train people on how to build and work on it etc etc.Mumbai–Ahmedabad bullet train project costs 1.1L Crores(US$15 billion) and recently institute, worth Rs 600cr is being set up in the campus of National Academy of Indian Railways.
Recently Africa’s Morocco got it's first bullet train

but the project was started in September 2011 and budget was $2billion (Covers 330-350 kms).
India might get it's first bullet rail by end of 2022*.80 per cent of the project is being funded by Japan so it might get finished as per schedule.
PS: Bullet train was in talks since 2009 itself but it became a serious matter in 2015-2016.An MoU was signed between India and Japan in 2013.Both India and Japan Govs did ground work for 18 months.
Land acquisition problems and Local parties/Opposition parties(It can be any party including BJP where it's not ruling) are extra headaches.