Back in the early '70's I used to go to a business near 31st & Kedzie, and just north of Kedzie a RR track crossed the street serving local industries. At the SE corner formed by the street and track was a remnant of the past, a horse trough. It was a light green color, maybe terra cotta, or some type of stone, or possibly even cast bronze. It was the last one , in fact the only one, I ever saw in the city. I've often wondered when it disappeared and what might have become of it.
The trough I remember on Kedzie was more like the one pictured here: http://www.flickr.com/photos/christiansphotos/4651496825/
Similar, but not matching, the base was different. It did not support the whole underside as seen in the photo.
I don't know if it had the fixture (?, whatever it is) in the center as I never got out of the car to look at it closely. In Googling "troughs, Chicago" I've learned that many were installed in the city by the Fire Department, and I believe filled from the hydrants. Interestingly the CFD still has a repair facility at 31st and Sacramento and I think a warehouse along 31st too.
The repair shop was much larger in the mid '50's and there was a big storage yard there too that held various old trucks (teens-'20's, etc) and equipment. BITD the CFD cast and machined the fittings they used on hoses and trucks, but I do not know why they didn't just purchase them.