What is this railcar for? (set 2126)

I came across the set review a couple years ago, when I was looking for ideas for a Christmas wagon. The set includes a cool wagon with Christmas trees, a flatcar with two cars, a dump car and a very strange platform with barrels. I'm still wondering what this car is designed for? It reminds me of an old wooden oil car and a pickle car. But it has an electronic control panel, which is not available for both versions. The photo is taken from the review mentioned above submitted by ...