By the way - it is always advisable to test first that the hand washing systems actually work; if they are the modern sensor operated type there is a high chance that they will not...!!
I certainly don't like the 387s (and similar) that have sensors to dispense soap automatically before the water starts. If the water runs out, you've now got a hand full of soap!
I get the idea, but I purposely avoid the soap and wait for the water. If the water comes, I then attempt to get some soap from the bowl.
Oh and these basins often have poor drainage, and if you see the water not draining - shield yourself when the hand dryer kicks in or it may spray it all over you.
Poor design IMO.
And talking of 387s.. My son demonstrated another issue yesterday on the Gatwick Express. He's five and I'd shown him how to open the doors (he is learning to read, so now knows Open and Close) but sadly yesterday someone opened the doors at Victoria and he then pressed the illuminated button just after - which was of course door close.
Now the thing I realised is that if you press door close then it will close the doors after they open and during that time the open door button doesn't activate so you can't change it. Even having your foot breaking the beam in the footwell doesn't work!
Luckily not too many people were getting off and I had to apologise. Frankly, I'm surprised you don't see kids doing this 'for the lols' but I assume they aren't aware.