President Tsai Ing-wen called the accident “heartbreaking.”
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Officials say scores were injured and at least person died after a train failed to stop at the Hoboken's station.
A witness told CNN the train appeared to enter the station "much faster than normal" and "went airborne."
It took firefighters nearly 10 hours to extinguish the blaze, which forced the evacuation of a small town east of Portland and spilled oil into the Columbia River.
German federal police have warned that the death toll of eight from the head-on collision is just a "snapshot" and may rise, as rescue operations continue.
Amtrak riders Wednesday said they felt safe despite increasing safety problems and a lack of government investment in infrastructure.
Moscow's mayor has ordered an independent criminal investigation into the cause of the crash, though foul play isn't currently suspected.