Chad,
Without looking at the asset myself, my guess the missing asset is the track. To find out which asset is missing, right-click on the asset in Content Manager and choose view config file. Look for the asset and note what it is. If it is the track it is easily replaced. Clone the asset and substitute the KUID number of the missing track for another one of your choosing by editing the config.txt file. This being an engine shed, concrete embedded track might work well, or some dark greasy/oily track might be a good sub as well.
John