motion for Sajdaĥ should be lower than that of the Rukū’ (i.e. one has to bend more for Sajdaĥ than for Rukū’). (Durr-e-Mukhtār, Rad-dul-Muḥtār, vol. 2, pp. 588; Baĥār-e-Sharī’at, vol. 1, pp. 671 )

2.       If there is enough space on a conveyance like a moving train etc., then one will have to offer Nafl Ṣalāĥ while facing the Qiblaĥ as usual.

3.       After a villager has been out of his village, he can offer Nafl Ṣalāĥ on the conveyance. (Rad-dul-Muḥtār, vol. 2, pp. 588)

4.       If one began Ṣalāĥ outside the city, in a conveyance, but entered the city while still offering Ṣalāĥ, he could complete his Ṣalāĥ until he reaches his house.

(Durr-e-Mukhtār, vol. 2, pp. 589)

5.       In a moving vehicle, without a Shar’ī exemption, one cannot offer any Farḍ, Sunnaĥ of Fajr, and Wājib Ṣalāĥ and cannot also perform the Sajdaĥ of recitation provided the verse of Sajdaĥ was recited on the ground. The Wājib Ṣalāĥ includes the Witr, the vowed [Nażr] Ṣalāĥ, or the Nafl Ṣalāĥ that was invalidated after being started. If there is a Shar’ī exemption then it is a condition that all the above-mentioned should be offered while standing and facing the Qiblaĥ, if possible, otherwise [i.e. if it is impossible then] in any possible manner.

(Baĥār-e-Sharī’at, vol. 1, pp. 673)