Water dripping off rolling stock

[goblinuser]

What causes water to drip from rolling stock? I saw it on class 172s which do not have toilets. It has not rained for a few days. However certain components under the cab and near the middle of the unit seem to spew out water.

My question is what is it?

 

[Nym]

Probably from the air conditioning packs.

 

[PHILIPE]

What causes water to drip from rolling stock? I have observed it on class 172s which do not have toilets. It also has not rained for a good few days. However certain components under the cab and near the middle of the unit seem to spew out water.

My question is what is it?

Probably sweat due to Aircon not working

 

[goblinuser]

Probably from the air conditioning packs.

Ah that was what I suspected. There does seem to be a lot of it. Is it increased due to the heat?

Probably sweat due to Aircon not working

Never had an issue on the Overground 172s with aircon, always incredibly comfortable.

 

[Crossover]

Ah that was what I suspected. There does seem to be a lot of it. Is it increased due to the heat?

It is condensation formed as part of the heat exchange, so yes, it will increase in warmer weather as there will be more heat to dissipate

 

[6Gman]

Perhaps the mythical Water Trains?

 

[dk1]

On the 170s it comes pours into the poor drivers open window thanks to the rubbish A/C in their cabs

 

[Thatcham Xing]

Last Summer I got caught under a virtual torrent that fell from inside the vestibule roof of a 166 when it decelerated.

I told the driver when I disembarked and he said "aircon, I'll report it"

 

[Kneedown]

Additional use of windscreen washers due to the predominence of various flying insects at this time of year could also be a factor. It tends to pool in places after running off.

 

[Bornin1980s]

I have another mystery. I've seen what looed like smoke coming out of a small pipe below a 156, seemingly independent of the actual exhaust system. Was it on fire?

 

[dgl]

I have another mystery. I've seen what looed like smoke coming out of a small pipe below a 156, seemingly independent of the actual exhaust system. Was it on fire?

I think that might be for the carriage heating which can be independent of the engine so that when the engine is cold you still get heat inside the carriage.

Although I might be wrong.

 

[TheEdge]

I have another mystery. I've seen what looed like smoke coming out of a small pipe below a 156, seemingly independent of the actual exhaust system. Was it on fire?

Its the Webasto heater system which has a little diesel burner in it. When the burner fires up if there is some unburnt diesel in there it'll produce a quite impressive cloud of smoke.

 

[mickulty]

This is interesting, I noticed the same on a 390 recently and was wondering about it. Thanks for posting about it and getting a discussion going.

 

[HLE]

On the 170s it comes pours into the poor drivers open window thanks to the rubbish A/C in their cabs

Or a 153 where the rain just gets through any nook and cranny possible.

 

[edwin_m]

The roof of a 156 is often wet, due I think to the toilet water tank sloshing out of the filler. Because of the roof corrugations water can often travel the entire length of the car from the toilet and drip down into the intermediate gangway.