When i was younger me and my friends used to go alton towers on the train. We used to buy a train ticket to Uttoxeter from a tiny village in huddersfield. And it was about 4 different trains to get there, but as long as your going in the right direction, i reckon itll be fine...
also, i paid to go from sheffield to huddersfield once and got on the wrong train and ended up in barnsley, but i got on the next train and it was fine.
SO. in conclusion. it should be fine..
sorry if i bored you.. and for using the word fine too many times..