Yes, a wee bit up grade from the present Coxo highway crossing. Yes, that is a snowshed in the distance.
I saw this pic years ago and I'm still impressed with it. It shows an interesting practice of using the "road engine" as the "helper" on the hill. I've also seen this practice on Cerro Summit. My take is they didn't want to put that much strain on the T12's wooden tender frame, the Mudhen was cut in behind it.
But, when you think about it, when they used C-class engines to help, it took the same amount of power from the second engine to help the T12 up the hill. Whether it was a C-19 or K-27, the same amount of power was needed to get up the hill on time. So, that theory doesn't hold much water.