Today I got some more information about the railway hotspot situation in the Netherlands.
It seems that the new portal I mentioned yesterday isn't exactly new. In fact, it’s the standard KPN (a major Dutch ISP) hotspot portal which is providing Internet access.
It turns out that our blog set some things in motion and KPN fixed the problem as I described, by redirecting to a different portal. It also turned out that the error had been present for quite a while, meaning a lot of users had potentially exposed their data.
While I was browsing the KPN hotspot site I came across this - a program which you can download which will secure the connection between your notebook and the hotspot.
I haven’t had a chance to look at it in depth, but I'm sure the extra layer of protection will come in handy.