Havelock flats

I paid a visit to the Havelock yard for a few minutes last week. At the time there were long strings of hoppers and flat cars being pushed around. Although the humble flat car is likely the most boring of freight cars, I find it the most interesting. I think it's because of its potential to carry a wide range of viewable things. 

On the day I was there one of the flat car strings had that special purpose car on the end. I don't know what it's called, but it looks like that square, yellow structure unfurls so things can be driven up on the cars. I need to investigate.