Passenger train toilet
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Many passenger trains (usually medium and long-distance) have toilet facilities, often at the ends of carriages. Toilets suitable for wheelchair users are larger, and hence trains with such facilities may not have toilets in each carriage.
The traditional method of disposing human waste from trains is to deposit the waste onto the tracks or, more often, onto nearby ground using what is known as a hopper toilet. This ranges from a hole in the floor to a full-flush system (possibly with sterilization). The hole in the floor (also known as a drop chute toilet) system is still in use in many parts of the world, particularly on older rolling stock. The principal disadvantage is that it can be considered crude or unhygienic and dangerous to health and the environment – it litters the railway lines and can convey serious health risks when the train passes over or under a navigable waterway. Passengers may be discouraged from flushing or using toilets while the train is at a station or standing at a red signal. To enforce this limitation, toilets may be automatically locked when the train pulls into a station or stops at a red signal. In the United States, railway employees were required to lock the toilets closed whenever a passenger train stood in a station or at any other location designated by instructions in the timetable. Toilets would promptly be unlocked upon departure.
Properly-designed drop chute toilets will draw air like a chimney, pulling air through the lavatory door vents and down and out through the toilet, reducing odor.
Hopper toilets are similar to old-fashioned sea toilets in that they release the excreta directly to the environment, untreated.
In October 2017, it was announced that the United Kingdom would phase out hopper toilets on all timetabled passenger services, to protect rail workers and reduce health risks.
Chemical holding tank
Chemical holding tanks (retention tanks) are usually included on 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, often at a terminal station or prolonged stop-over. If a train needs to be used again quickly, the tanks may not get emptied. In this case, toilets may back up, which can result in toilets being closed.
Vacuum systems used in the newest carriages are similar to those in airliners: waste is pulled into a holding tank with a high pressure pump. Their disadvantages are the same as of chemical holding tanks, in addition they require stable power supply for working, and flushing of anything else but water and human waste (e.g. toilet paper) can easily break the pump.
Some trains may have composting toilet tanks, which use bacterial action to break down solid and liquid waste before releasing it to the trackbed by way of a chlorine sanitizing tank.
Passengers will please refrain
From flushing toilets while the train
Is standing in the station (I love you)...
In the station restaurant the general began to speak again about the latrines and to say how ugly it looked when there were cactuses everywhere on the track. Meanwhile he ate beef steak and all of them imagined that he had a cactus in his mouth.
Traditional hole in the floor system, operated by a pedal
Squat toilet in Chinese train
Toilet in Taiwan high speed rail train
"DO NOT USE the toilet while the train is stopped at the station" notice in Polish, German, French, and English, displayed by Polish State Railways
- "Toilets Of The World - Train Toilets". Toilets of the World. Retrieved 10 October 2017.
- Gwyn Topham (10 October 2017). "No more platform No 2s: train toilets to stop emptying on to tracks". Theguardian.com. Retrieved 10 October 2017.
- ""Passengers Will Please Refrain" Song Lyrics and Music Score". Horntip.com. Retrieved 10 October 2017.
- Hašek, Jaroslav; Parrott, Sir Cecil (10 October 1985). "The Good Soldier Švejk and His Fortunes in the World War". Penguin Books. Retrieved 10 October 2017 – via Google Books.
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