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Check the nuclear submarine thread. Significantly larger boomers than the first Arihant sub are already constructed.

To answer your second question, Agni 2 and 4 are too tall to be placed in a submarine no matter how much modification. India has K4 missiles for submarines, and is developing the Agni 6 which will be more suitable for submarines.

Topol-M is mounted on a truck, which can go on roads and grass etc. Rail launched missiles are mounted on specialized trains. An example of a rail mounted missile is the soviet RT 23 Molodet ICBM, now decomissioned to be replaced by a newer rail mounted missile in development. Goes to show how...

The picture above is an Agni 2, which is a rail mobile MRBM. So not road mobile, but not in a silo either.