Sydney's recycled water trains ...

Excerpt from news.com.au:

Metro rail in 'potential reservoir'

21 March 2008

Tunnels flagged for Sydney's northwest metro rail project have already been earmarked by the NSW Government as a potential underground reservoir, the State Opposition says.

Opposition transport spokeswoman Gladys Berejiklian says the Government's "double-dipping" shows the ad hoc planning of the $12.5 billion metro rail project.

"Before it has even gotten off the ground in relation to consultation, we have a Government double dipping, trying to use it both as a water reservoir and also as a train tunnel for a metro system," Ms Berjiklian said.

"Both can't co-exist."

In February last year, Premier Morris Iemma announced that disused train tunnels at St James Station could be used to supply the city with more than 17 million litres of recycled stormwater a year.

See - Trains and storm water don't mix.