Tomatoes pictured growing in human excrement flushed onto railway track by train toilet
Tomatoes pictured growing in human excrement on lines in Rochford, Essex
RMT union calls on the Government to replace trains that flush onto rails
Rail workers are 'routinely sprayed with waste', union chief says
Most modern trains are fitted with septic tanks which store the waste
But tanks cannot be fitted on some older carriages which dump excrement
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