I use the trains often here in France as a over 60 the prices are very good minimal cost for first class and choose your seat.
Never use the Metro cheap enough to take a Taxi as in Paris no meters it's fixed prices makes it the way to do it for me.
It's definitely not like that in London
Last time I went was 7 years ago ,we took our daughter to see matilda
My wife had a neurological illness , she took one look at the escalator at Euston, a mile long doing 90mph and said no so we got in a taxi
Euston to Earls Court , as we set off the only Englishman I spoke to in 3 days said this
I carnt go fru da centa of laaanndun, veres a demonstrashun on so I gotta go raaund
I translated that to my wife who's from the North West and we set off
I sat there looking at the meter as we crawled along thinking **** me
We arrived at our hotel , I could've flown to Paris for the £36 it cost
After that she had to put her big girl pants on and conquer her fear of escalators