Aban ibn Taglib says: I heard Imam Jafar al-Sadik say, “It is as if I can see the Qaim [Hazrat Mahdi (as)],... he will ride a black and white horse shining between its two eyes...” (Let Us Know the Imam of Time, the Imam Mahdi, Ali İrfan, p. 94)
This hadith refers to present-day rapid transport vehicles in the time of Hazrat Mahdi (as). Our Prophet (saas) notes that these vehicles will be very fast and permit rapid transportation from one place to another.