Originally Posted by
birdstrike
Not too many years ago, on a regional in Spain, I recall seeing the ties flashing by under the toilet. . .
Also not too many years ago Amtrak trains transiting Denver had to shut down their (holding tank) toilets while within the city limits.
For all I know, they still do.
All current Amtrak trains have holding tanks in each car - and they're emptied at the end of the run. That's why you may see a "Out of Order" sign on some rest rooms, but not on the ones in the next car.
True, the cars from years ago did not. That's why you could see the tracks when you flushed.
I don't know about other countries, but I'm sure many trains do not.