Two people died at the scene of the crash, while two others died at Midland Memorial Hospital, City of Midland spokesman Ryan Stout said. Ten of those injured are in critical condition, while the other seven are in stable condition, he said.
"There is going to be a very thorough investigation," Lange said. "It's obviously a very tragic incident."
The parade was to end at a "Hunt for Heroes" banquet honoring the veterans. The wounded service members were then going to be treated to a deer-hunting trip this weekend. The events have been canceled.
Lange said Union Pacific is offering help to the community and victims' families, as well as peer-to-peer counseling for the train crew, who did not sustain any injuries.
"It's pretty traumatic for them," he said.
The National Transportation Safety Board also is investigating, NTSB spokesman Peter Knudson said.