For some reason the RMT▸ chose to make an enormous song and dance about this whilst more or less ignoring all the other direct emission bogs whizzing around the network.
AFAIUI, the RMT made a fuss about the Mark IV toilets because they produced more of a problem with aerosolised effluent rather than other toilets which generally dump their load straight onto the track.
I think that the problem arrose after the Mk VI refurb which placed a controlled emmissions toilet orginally designed for staff use only at the disposal of the public. The extra load meant that the toilet couldn't cope without regular emptying (and
GNER▸ went back on a promise to install emptying points at their depots to allow this to happen). The key difference was that toilets designed to dump onto the track do so fairly safely, whereas overflowing
CET▸ which are not designed to dump onto the track do it as a dangerous fine mist.
I used to work in an HIV lab and received training on how do handle the virus safely. These bugs (and similar things like Hepatitus) are farily safe if you are sensible about gloves and hand washing etc. But I has told that the think you absolutely didn;t want to do was breath in an aerosol containing virus (elborate precaution were taken ert centrifuges and thinsg like that that might produce a viral mist.
I don;t usually take the RMTs side, but personally, I would strike over this isue. GNER were lucky
IMHO▸ to not get done under
H&S▸ law over this.