Just a last update of the route Haygood took through the railroad yard.
Below is a pic by Jim Murray taken shortly after the assassination. Circled on the left is Haygood stood under a tree. Circled on the right is Harkness.
There is only one tree in the railroad yard itself. Below is the updated route of Haygood.
1] Haygood gets off his bike
2] Haygood in Cancellare on the underpass
3] Haygood in Darnell behind Craig
4] Haygood in Darnell walking towards TSBD
5] Haygood in Murray pic under the tree
Can Haygood make this route in 5 minutes?
Easily.
Photographic evidence has Haygood at point [2] about 1 min 40 seconds after shooting. This gives him three to four minutes to walk the route. There is absolutely no reason to believe he could not complete the route in this given time. It's easily done.