The green leather train stinks when it first started. What caused it?

Maybe it's the smell of the bathroom, maybe it's the smell of the coal-fired water heater.

Because green leather cars have no vacuum urinals, they are all straight-lined, so the so-called taste may be a little bigger.

In addition, because green leather cars are about to be eliminated, they are rarely equipped with electric tea stoves, all of which burn coal and may smell of coal smoke.