Colorado Eastern Coal Trestle, what is going on with this building?

So the Colorado Eastern RR in Denver was originally built to haul coal from a small coal mine south of what is now Denver International Airport to the Omaha & Grant Smelter where the Forney Museum is now located. The Burlington & Missouri railroad blocked the Colorado Eastern from crossing it's line into the actual Grant Smelter, so it's likely that wagons had to haul the coal across the tracks, which explains the coal trestle. But my question is why does the coal trestle have all these short sidings and why was it built at a curve? The tram cars on the line were practically just standard underground coal mine cars, which were usually dumped via a jib crane lifting up one end. Could that have been what these were? It just seems impractical to me to haul these primitive coal cars 17 miles.