Originally Posted by
ksandness
That's what I would say. At typical exchange rates, the Heathrow Express costs more for the 15-minute journey between LHR and Paddington than the Narita Express does for the 70-minute journey between NRT and Tokyo (Central) Station.
I used it on my BritRail Pass, because I was going on a train that left from Paddington the same day, but that's the only way I'd ever ride it. I'ts nice but not THAT nice.
Yokohama -> Narita is even more than to Tokyo Station, but it's even cheaper than the Heathrow Exp. That's highway robbery

forget that, I just take the Picadilly line or wahtever.