There are several Google posts about the train derailed by explosives. The aljazeera link below includes a nice map showing the location in Russia about equidistant from Ukraine and Belarus.
This next link reports another recent train derailment with fire also in the Bryansk region but closer to Ukraine. There is also a second link at this one, perhaps with photo of the other derailment.
https://www.bbc.com/news/world-europe-65458847
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