During their fourth and final on-site media briefing on November 18th, N.T.S.B. officials said that all warning signals at the railroad crossing where the crash -- which killed 4 military veterans and injured 17 other people -- took place were working at the time of the fatal incident.
N.T.S.B. officials also said that they've ruled out errors by Union Pacific railroad workers as the cause of the crash.
However, officials added that the investigation into the crash is far from over.
The N.T.S.B. is now focusing on determining at what time and distance the Union Pacific freight train conductor saw the Show of Support Hunt For Heroes parade float that the train ultimately plowed into.
The N.T.S.B. plans to conduct a sight distance test on November 20th.
During the sight distance test, where a similar train engine and big rig will be brought to the accident scene to re-construct the crash.
Due to the accident re-enactment, the railroad crossing at South Garfield Street will be closed.
Midland officials say that the intersection of South Garfield Street and West Industrial Avenue will close at 12 PM on November 20th.
The intersection of South Garfield Street and West Front Street will also close around 1 PM on November 20th.
Both intersections -- and the railroad crossing between them -- are expected to open at 4 PM on November 20th.