求救：订英国火车票时遇到的问题求救：我定Edinburgh to Cambridge的火车票时，要在Stevenage换乘。网站显示如下信息： Stevenage to Cambridge Reservations for this part of your journey are not possible. 这是啥意思？
that means, for this route between Stv and CAM, you have not been reserved a seat. So you may need to find an empty seat after you get on the train. But this is mainly because this route is quite free and there could be plenty of seats empty :)
