Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Empire Builder N gauge set

I have been a model railroader for years in HO scale. I do not have the space I had in the past so I ordered an N gauge set. The 4-8-4 I ordered is not a smooth running engine. It has to be pushed to start and will not stay running. I find the track to be OK but falls apart easy. You will need to nail it down or it will lift up and cause cars to derail.