Because I do love it, but I don't agree that the changes that they wish to make are right. I think we can do better than that. I think we can do better than watching our colleagues fear losing their jobs or being forced out. Because I think that the direction that they want to go in would have detrimental impacts to the quality of our railway. I love it and want to see it do better.
While not all S&T jobs need three people, I find that the vast majority are made safer, more flexible, and more efficient by having that third person. It is more nuanced than just having 3x staff hours rather than 2x staff hours as those hours can be used more effectively with three. It has parallels with the "just in time" supply chain model, it can be cheaper if everything is going well, but if there is a disruption the consequences are more severe. Running at the bare minimum is not always worth it in the long run.
If three people are rostered and one goes sick, then it's likely that a lot of the work can still be achieved. If two are rostered, then unless someone can be persuaded in at short notice, nothing can be done.
If the work is over a long stretch then with three people one person can drive around and collect them. Two miles are walked, rather than having a four-mile round trip, spending more time trackside and doing two miles of unproductive walking. If they are a response team and a fault occurs when they're part way through the walk a third person with the van could collect them from the nearest access point, rather than having to wait for them to walk back to their van, up to two miles away. I've done work in one day due to that third person that took us two or three days with just two.
If working at heights is required then three people are required. If working at height is required as a response to a fault the fault will have to wait until a third person is found.
Point maintenance tasks are vastly more efficient with three people. Just getting the equipment to site is safer and easier, and people aren't pressured into attempting to carry too much and increase the risk of injury to avoid wasting time making two trips. (For reference the kit for some fairly routine point maintenance would be: cleaning sprays/lubricant, rags, brushes, grease gun, point handle, gauge pouch, track gauge, 3-4 spanners, multimeter, general small tools, and a 20kg light at night). Some point maintenance tasks can be done with just two people, but it's two or three times faster with three people.
On a common axle counter failure the best way to identify where the problem is occurring over a several mile stretch is to physically check the security of terminals and see if any disturbances are triggered in the process of doing so. It is often the case that something may appear to be well-terminated, but is just poor enough to cause a poor connection. With three people one can remain with the diagnostic laptop while the other checks, if any warnings are triggered they can contact them and the problem is fixed there and then. If there are two people then the alternative is to check the security as best as possible, recording the times at each location, travel to carry out a diagnostic download, and then return to the location that was being checked at the time of the disturbance. One method is vastly more time-consuming and less efficient than the other...
Three people aid in the never-ending battle against vegetation. Where there is a task that can be carried out by two people, the third can clear vegetation around assets and walking routes. That time is not wasted but is harder to capture. With two people either that time is lost, or it gets ignored, making it harder for the next person.
With three people one person can focus on safety arrangements more predominantly, rather than having to do that and any work that requires two people. It doesn't have to be all they do, but they can dedicate more of their energy to that rather than trying to do everything. On faults I'd quite often ask someone else to COSS so that I'm not having to share my attention in that way.
In a team of three if someone has an injury and requires emergency assistance there is someone to meet the emergency services at the access point and there is one person who can remain with the casualty. In a team of two the uninjured party will have to weigh up leaving the casualty alone vs hoping that the emergency services are able to navigate to them and are willing to enter the railway unaccompanied.
I'm not aware of any studies that have been done comparing the safety of working separated with site warden vs working separated COSS+1 (probably because they are recorded as the same thing in the majority of systems), but I would be very surprised to find that it was not safer to have a site warden whos job is to keep you right and ensure that you do not lose situational awareness.
In the model where the third person is a general dogsbody who is allocated when required, the opportunity for learning on the job is reduced, and progression avenues are not naturally occurring. What incentive does a teamleader have to teach them when they could have someone else the next day, or no one at all? Teaching people is beneficial for all—the learner knows more, and is more engaged/satisfied because they understand what is going on, the rest of the team benefits because they have another useful pair of hands at their disposal rather than someone that's just sort of hanging around because it might as well be a mysterious arcane ritual to them.
To sum up, the role of the third person is hard to quantify, but they are important in many subtle ways and everything works a lot smoother with them. I think it would be a mistake to remove them. Even just discovering that something is unexpectedly required, say two padlocks were found to be broken and you need a second spare. That third person could fetch one from the van. If they're not a general dogsbody floating around between teams they might even know where to find it in the van! Or in the case of something more technical, they might know what it looks like.
On this point I do agree, and I feel that having and utilising more PCs (Protection Controllers) would be of benefit. It isn't always possible due to the nature of the work but it could be done more often than not, and I think it's something that really does need doing.