#TrainThursday
Changing the bogies on the Trans-Mongolian Train, entering China at Erenhot.
There is difference in rail gauge between Mongolia and China. Rather than change trains, they physically change the wheel-sets to Chinese width.
Okay, I know this isn't actually a thing, but I ran across this picture of mine just now (from a couple of years ago) so I'm declaring it #TrainThursday