I'm in a picture posting mood. Here's Belt Railway of Chicago's Electro Motive model SW1200 number 524. I had an apartment in La Grange Park in the 1980's that looked out on the BRC / IHB tracks. I watched a lot of trains and every afternoon the BRC's Alco Centuries would pass by around 2pm. They had a very distinctive sound. They've retired now and I miss them.
Belt Railway of Chicago loco 524