Originally Posted by
LupineChemist
FYI, if you do it again, from T4 to Atocha, the cercanías line is cheaper, faster, and doesn't involve any changes. Though it's 30 minutes between trains if you catch it wrong, but I'd still go for it.
Unfortunately, I had flown in on Air France which didn't use T4

I think the OP is also in the same situation