Police in the northern city of Bremen are verifying the authenticity of the letter and are working with authorities in the other two cities, a spokesperson told AFP on Saturday.
The letter, published Friday on the far-left online platform Indymedia, clearly refers to an incident on Monday, when unknown persons set fire to cables on Deutsche Bahn railways in Bremen.
The letter describes Deutsche Bahn as a central element of the capitalist system and military infrastructure.
Monday's sabotage significantly disrupted high-speed rail traffic to neighbouring Hamburg.
READ ALSO: What's behind the spike in arson attacks on Germany's railway network?
On Friday, meanwhile, a cable fire on Berlin's railway network caused considerable disruption in the German capital with hundreds of trains delayed, diverted and cancelled. An investigation has been opened, but Deutsche Bahn has already ruled out a technical fault.
Diversions and delays could continue until the end of the day on August 6th, the rail operator said on its website. You can see which lines are impacted here.
"The repair work will continue over the weekend. Train services are expected to be restricted until the beginning of next week," Deutsche Bahn said earlier.
Over in neighbouring France, a series of arson attacks on the country's rail network caused huge disruptions last week shortly before the opening of the Olympic Games.
Fibre optic cables near the tracks, which ensure that safety information – red lights, etc – is transmitted to drivers were cut and set on fire at various locations on the network.
French interior minister GĂ©rald Darmanin said that this was a "traditional mode of action of the far left."
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