Germany’s national railway company has criticised climate activist Greta Thunberg after she posted a photo of herself sitting on the floor of a train surrounded by bags.The teenager posted the tweet late on Saturday with the comment: “Traveling on overcrowded trains through Germany. And I’m finally on my way home!”In the picture, Greta is sitting on the floor at the end of a rail car with her back leaning against a suitcase, staring out of a window.There’s an empty food box next to her and more suitcases and backpacks piled up by her side.Traveling on overcrowded trains through Germany. And I’m finally on my way home! pic.twitter.com/ssfLCPsR8o— Greta Thunberg (@GretaThunberg) December 14, 2019Some Twitter users pitied the Swedish activist for not being able to get a proper seat on the train for the long ride home from Madrid, where she was attending the UN climate change conference.The 16-year-old activist does not fly on planes because of its impact on the environment.German railway operator Deutsche Bahn has come under fire in recent years for delays, last-minute train cancellations and expensive ticket fares.Deutsche Bahn initially replied to the teenager’s tweet, wishing her a good trip back home, adding “we continue working hard on getting more trains, connections and seats”.Liebe #Greta, danke, dass Du uns Eisenbahner im Kampf gegen den Klimawandel unterstützt! Wir haben uns gefreut, dass Du am Samstag mit uns im ICE 74 unterwegs warst. Und das mit 100 Prozent Ökostrom. 1/2— Deutsche Bahn AG (@DB_Presse) December 15, 2019Noch schöner wäre es gewesen, wenn Du zusätzlich auch berichtet hättest, wie freundlich und kompetent Du von unserem Team an Deinem Sitzplatz in der Ersten Klasse betreut worden bist. #Greta 2/2— Deutsche Bahn AG (@DB_Presse) December 15, 2019But later on Sunday, Deutsche Bahn tweeted twice more in regard to Greta’s train travels through Germany.In the first tweet, the company thanked the teenager for supporting Deutsche Bahn’s battle against climate change and pointed out the train she used had been running 100% on eco-friendly electricity.In the second tweet, Deutsche Bahn seemed to suggest Greta had not spent the entire train ride sitting on the floor.The company pointed out to the teenager that “it would have been even nicer if you had also reported how friendly and competently our team served you at your seat in first class”.Our train from Basel was taken out of traffic. So we sat on the floor on 2 different trains. After Göttingen I got a seat.This is no problem of course and I never said it was. Overcrowded trains is a great sign because it means the demand for train travel is high!— Greta Thunberg (@GretaThunberg) December 15, 2019Greta later tweeted the fact she did not first sit in a seat was not meant as a knock against Deutsche Bahn.She wrote: “This is no problem of course and I never said it was. Overcrowded trains is a great sign because it means the demand for train travel is high!”Greta was recently named Time magazine’s Person of the Year for her efforts to prod government and others to take faster actions in fighting climate change.Related... 'They Need To Wake Up In 2020' – Anger As UN Climate Summit Ends With No Major Action Taken Donald Trump's Got His Knickers In A Twist Again About Greta Thunberg James May Claims Jeremy Clarkson's Tirade Against Greta Thunberg Is Because He's 'Threatened'