It is not permissible for her to travel without the companionship of a male mahram!

If she fears harm, she can pray sitting down.

A sister is on journey (above 200 km) on the train. She reaches ground after Maghrib has come. So it would be allowed to shorten her prayers in shā Allāh (Dhuhr 2 rakat and 2 Asr and is able to join them together during the train drive. Please correct me if im wrong). But here is the problem: There are everywhere non-Mahram around and there is no place safe in the train to pray. Also there is no one to look for her back. Is she allowed to pray the shortened Dhuhr and Asr in the train while sitting since she fears harm from the disbelievers.