I remember in the seventies we made numerous equalizers as shown on the U50 B trucks plus other equalizes for other equalized designed trucks. There was a C truck design for export locomotives that had the equalizer primary suspension. The equalizers held the primary suspension and the spring plank the secondary suspension on the trucks. The operations on the equalizers were burn, drill, precision burn and blend and grind. I looked up the info on the internet on the U50 and it also had span bolsters at that time. If you notice the brake rigging is clasp type with probably iron shoes although I could be wrong on that. Most of our export locomotives at that time had iron shoes and clasp brakes. Overseas the composite brake shoes were difficult for the countries to acquire.
Here is my favorite railroad hat and I only wear it occasionally. I got it 15 yrs. ago from the plant manager. He said it was his last one to give out. There is a lot of history on the hat. I was in Montreal doing a wreck assessment on a burn unit. Enjoy.
Concerning my previous post I found an old topo map that has all three tunnels on it. The long ones are a mile or so each then a short one. Tunnel 3 is in the lowerleft corner above Clems