I'll echo that. If you do go you should ask how they got saved from destruction and you will be amazed at the stories of trams being squirreled away in corporation sheds without the knowledge of the powers that be but with the collusion of local supervisors.
The site history is interesting too. If I remember correctly the group that owned the tram collection were looking for a source of rails and the Derbyshire site were going to get rid of their narrow guage syetm. (It's basically a quarry).
The upshot was that rather than remove the rails the tram guys were offered the lower part of the site complete.
As Patric says, a good day out.
regards Martin