"Faa' In Khiftum Fa-Rijaalan Aaoo Rukbanan." (Arabic Language) which translates as:
"If You have fear of Allah, You should offer the prayer whether you are on foot or you are in any vehicle (Sawaar)."
So it is mandatory for every Muslim to perform his prayer even he is travelling in the train.
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....Indexing of pages for easy navigation is included