Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The train in a dream indicates travel or a change of conditions. Riding it indicates moving from one state to another. Missing it indicates missing an opportunity.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The train indicates lifespan. Its speed is the speed of life passing. An accident indicates a calamity.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The train is interpreted as worry. Whoever sees himself ride it will be afflicted with worry.