Re: Where to find this specific item?!

That is a bolt that you buy from the train shop. To get to it you need to click on your station as if you were going to load your train, then in the upper right hand corner of your screen, click the little gift bag. This is the train shop. The bolt should be one of the first few items in the list. You'll be paying for it with rail simoleons. I hope this helps you find what you need.