Smoky SD70M-2 on CN PTC train + Two IC SD70's lugging 185 cars on L536

First up is a very unusual move on the CN Chicago Sub: A CN PTC test train went north on Main 2 to Kelly, where the line becomes single track. Then, as shown here, it reversed direction and headed back south on Main 1. As it passed by 47th St., it met northbound M337, which you'll see briefly. A camera issue lost my footage of the meet.
Later, tripod-equipped, L536 heads south at the same location with a classic pair of two IC SD70's, with 185 cars on the drawbar - and you can hear it! Like usual, there are some interesting cars in the mix, like ex-WP and ex-SP boxcars, a crisp tank car with an underframe, an ex-SP gon, and more.