Chemical Retention Tank
Chemical retention tanks are usually present aboard newer carriages and railcars in wealthier and more densely populated parts of the world. One issue is that the tanks need to be regularly emptied, usually when being attended at a terminal station, or prolonged stop-over. If a train is required in service again within too short a period, the tanks may not get emptied. In this case, toilets may back up, which can result in toilets being closed. Another point of note is that carriages may have less "in service" time if fitted with chemical retention tanks.
Read more about this topic: Passenger Train Toilet
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