[Enchante]

Mentions in this article of the "caravan" getting trucks and school buses to carry them on one leg of the journey (sounds like a minor part of the trip, though, so far). Also, discussion of them preparing to ride on top of freight trains, although it sounds like their first couple of attempts they could not hook up with a train when they needed it.

Buzzfeed: "A Huge Caravan Of Central Americans Is Headed For The US, And No One In Mexico Dares To Stop Them"

[Enchante]

From the reference in the Buzzfeed article it seems that this mucking around on the train cars was just for "practice" in preparation for actually trying to ride the rails, so this photo may be taken at some rail yard or siding: