Back flush setting onboard train toilets

[Aictos]

Any idea what this is used for? I’ve heard about it but not sure on what it’s for?

My question relates to Class 700s but interested in all MUs with this.

 

[37057]

Unblock bogs. Stand well clear...

 

[Aictos]

Unblock bogs. Stand well clear...

So does this mean that all the stuff blocking the toilet would be powerful enough to cover the area in the stuff eg if the toilet seat is down, the pressure be enough to lift the seat up?

Does this even get used?

 

[FGW_DID]

Rule 1: Make sure the toilet seat is down and held down!

 

[aleggatta]

I was told a story about some engineers that went to bombardier to see the 387/1 production line, who were given a unit to try out, so proceeded to block the toilet(with paper) and carry out a back flush without the lid lowered... The cubicle was Pepersprayed with the wet paper, and the fitters proceeded to close the door and continue down the unit carrying out their inspection...

 

[Aictos]

Rule 1: Make sure the toilet seat is down and held down!

Rule 2: Make sure the exit is clear if obstructions!

What brought it on was simply when travelling on trains and you see a toilet that’s blocked up, just wondered how they cleared it that’s all.

Wasn’t sure if it was just the case of connecting to the CET tank and emptying it or using the back flush?

 

[37057]

There's also a service flush cycle to operate the toilet forwards but without the use of water, so just a dry flush to help pass the 'difficult' content through as well as sending it backwards.

Back flush can be powerful. I've known people to place bin bags on the open pan, drop the lid and stand on it!

Unlocking bogs is common. I don't often need to do it myself but see the presentation teams do it regularly when units drop on the fuel roads at night.

Emptying the CET will only remove whatever content has made it there. If the vacuum toilet cannot process whatever's in the pan then it may have to be sucked out and perceiverence needs to come into it.

Some toilets you can operate the control valves manually, but get it wrong you risk catastrophe.

 

[Aictos]

There's also a service flush cycle to operate the toilet forwards but without the use of water, so just a dry flush to help pass the 'difficult' content through as well as sending it backwards.

Back flush can be powerful. I've known people to place bin bags on the open pan, drop the lid and stand on it!

Unlocking bogs is common. I don't often need to do it myself but see the presentation teams do it regularly when units drop on the fuel roads at night.

Emptying the CET will only remove whatever content has made it there. If the vacuum toilet cannot process whatever's in the pan then it may have to be sucked out and perceiverence needs to come into it.

Some toilets you can operate the control valves manually, but get it wrong you risk catastrophe.

I didn’t know there was a dry flush ability!

Doesn’t the dry flush also depend on if the CET tank is full or not?