Hi there,
Just wanted to double check whether or not I need a supplement to travel from Amsterdam to Rotterdam (I am travelling from Amsterdam Centraal to London) as it suggests in the Eurail planner app? I am just a little confused as I have gotten mixed information, with some people saying yes and some people saying that's old information. I tried to book a supplement online and it only gives Rotterdam and Schipol as options for starting stations and no option for Amsterdam.
Any clarification would be greatly appreciated!