Barrasso and Cheney both planned to travel to the West Virginia meetings by auto.
Oklahoma GOP Rep. Tom Cole says a person on the truck may have been injured. I am praying for those who may be seriously injured.
Arizona Sen. Jeff Flake told CNN he was on the train near the front, and got off to help.
Congressional Institute spokesperson Jessica Twohey said both of those people were inside the inside the garbage truck.
The office of Rep. Roger Marshall, R-Kan., said the lawmaker and doctor was helping people who were injured. Representative Duffy said he saw the other individual being life-flighted out from the scene.
Cole said he felt "a tremendous jolt" when the accident occurred, almost two hours after the train left Washington headed to the Greenbrier resort in White Sulphur Springs, West Virginia.More news: Saudi Arabia closes Ritz detention centre but 56 remain in custody elsewhere
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Leonard Lance, R-7th, was uninjured in the crash of an Amtrak train on its way to a GOP retreat in West Virginia Wednesday, one day after President Donald Trump's State of the Union address.
Officials have since confirmed one person has died, while another has been injured. Video from the scene showed the battered truck afterward, with trash strewn around it.
"I'm fine compared to, tragically, the truck drivers, and thankful for the prompt action of our doctors and first responders". White House press secretary Sarah Sanders confirmed in a statement that there was at least one fatality from the collision, though it was unclear who that was. The chartered train was carrying lawmakers to a retreat.
Daines tweeted from the train that he's ok, but called for prayers for the drivers of the truck.
"There's a lighted crossing guard where the train crosses", Hill said.
This is a developing story.