Haven't been for ages but always loved it.If ever I want to score points with the wife... I suggest we take the bairn to York. Jorvik in the morning and Rail musuem in the afternoon, he is transfixed, and she gets to go to the retail outlet place.
York Railway Museum is amazing. Still never been to the Shildon branch though
Still working on the 6 yr old. Went in the library today to get some activity books as we were a bit bored due to him not being at school. Nabbed a train book for the purpose
Shildon is OK for an hour or so. Worth a look for free