British trains are much, much worse ?
Even on the old ones I never had a river of sewage running in the aisle, and the new ones are surprisingly good.
I'd suggest it's you who haven't been on one, and as above posters said, being stuck alongside excrement for hours on end is NOT acceptable.
All of those who've patronisingly said 'sh1t happens ' - I wonder exactly how long you'd tolerate that in your hotel room ? Count it in nanoseconds, but it's ok for SLF for hours...