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I have the Emerald night from years ago which was sat intact inside of a box in my cupboard, just recently pulled it out and set everything up but it's not working as intended.
The top speed is about half to 2/3rds of what I see in Youtube videos of it and at lower speeds it has a very jerky motion where it stops for a split second before jumping forward some distance in a rhythmic motion, just for reference this doesn't happen when the wheels are only in contact with the air and it only happens when running normally on the rails. Anybody experienced enough to know what bit might be the cause of this problem in particular? I'm effectively a newb with Lego so I'm at a loss for what might be causing it.
