Unfortunately, in the news article mentioned, the names of the trains are spelt out, and moreover, written in Hindi. Auto-tagging will not work here.
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However, you may trigger auto-tagging by appending the list of Train Numbers at the end of the News article. In the above news article, just add:
12939 12940 12925 12926, 12465, 12466 .... and so on.
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more...
This will be auto-tag all the above trains. Similarly, if you would like to add multiple stations, then append the list of station codes in brackets to the end of the News articles.
[JU] [JP] and so forth.
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Any further suggestions to ease the tagging process are welcome.