Lots of train stuff here... a train, bridge, tracks, a turn-table
Interesting collection of engineering structures.
The bridge at left is an example of cost versus aesthetic.
I worked on one such bridge and they took the aesthetic route over cost.
The deck of the rail crossing diagonally over the top of other in your photo is rectangular. Easy and cost effective to design construct.
Had they just built a bridge to accommodate the overhead line(s) the width of that deck would be narrow and parallel to upper rails, but would require massive edge beams of considerable length, but only short cross beams and narrow deck.
Those long edge beams are engineered to suit and expensive to build.
But the bridge looks so much nicer.
That one looks like a mistake at worst, or a road bridge with approaches removed and a rail built across it diagonally.