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Chris J Dixon · January 24th 19, 06:13 PM posted to uk.railway,uk.transport.london

wrote:

Why does it need even that? A purely mechanical flush would work fine. Its
not as if the train is doing barrel rolls.

I wish you luck in trying to find a route to the retention tank
for a domestic size waste pipe, and in dealing with the volume of
water required.

Vacuum toilets are not cheap, or simple, but they make retention
toilets possible.

I was involved in planning work on a trial system to be fitted in
place of an inboard retention tank (which was abandoned once the
real cost/benefit figures began to emerge). This was very similar
to the kit used on submarines, and was essentially a
bio-digester, which produced clean water of a quality suitable
for flushing, thereby much extending the service intervals.

Chris
--
Chris J Dixon Nottingham UK

Plant amazing Acers.