For the Railways, not a penny. The various constituent parts are run as franchises with limited timescales. As those franchises expire, they are either put back out to tender, or they can remain in public ownership. There is no cost involved to the taxpayer in simply waiting for the existing franchises - which have encouraged a damaging culture of short termism and under investment - to expire.
Who owns the actual rolling stock? Would we have to buy all that or replace it if we reclaim the franchise?
