Day 3 covered the 110 km from El-Abiad to Ma'an. None of this section sees any regular traffic, despite it passing two phosphate mines. All phosphate traffic in this area goes out by road.
We visited the two mines, El-Abiad and El-Hassa - each branch a few km long - by propelling the train up the branch.
We had a "proper" visit to Ma'an next morning. We overnighted in Wadi Musa, close to the ancient archaeological site at Petra, then returned to Ma'an next morning.