Originally Posted by
Eastbay1K
Make sure your tickets are available on all services (high speed). Seems like most are. I think it will advise you if your potential purchase is not. The trains are nice and smooth and comfortable enough for a commuter type rail. The trains go at a good clip (120-130 mph) until Ashford and then slow down to approx. 80 mph.
I'd suggest you purchase online and print the tickets with the QR codes.
Tickets should say PLUS HIGH SPEED if valid on HS1. No need to print tickets unless you are worried about the risk of your phone battery dying and being unable to charge it. No need to register or log in to an app either - the tickets are PDF and should be emailed to you