On like, or you can get like, the Trainline app. And it's quite simple on there.
可以下载 Trainline 应用程序，在那里买非常简单。
英语百科
Trainline
Trainline, formerly branded Thetrainline.com, is an online seller of train tickets for British train services. It sells tickets through its website, by telephone, and through its mobile app which is available on iOS, Windows Phone and Android platforms.