This is already how it works.

When workers need to access a portion of railtrack (a block), they need to request a possession and isolation from the command center of the line. A possession means no train can approach less than two blocks from the block they will work on, and an isolation means the power is cut (most lines in Europe are electrified).

The procedure to perform this has been specifically designed to avoid miscommunications, with multiple back and forth between the operators on the ground and the command center to ensure one doesn't mindlessly make a mistake. Usually it's done by phone but I believe some lines now have apps for it.

This accident should not have happened. If the possession had been granted then at the very least the signaling system would have warned the train driver to stop several kilometers before he reached them. On modern lines the train would have stopped automatically, without human intervention. And signaling systems are extremely robust, they don't "bug" in a way that makes this possible.

To me this must be a human error. Either the workers worked without a possession (because they though it would be ok, the line was not operating at that time, it was a short operation, yadda yadda. The exact reason why possession requests are mandatory...) or it was an old line and the train driver was not paying attention to the point of ignoring several, big reg lights telling him to stop.

Either way, no GPS location sharing would have helped if someone disregarded safety instructions. :/

Source : I'm not an expert but I did an internship in a company who designs signaling systems in Europe and my project was specifically on the subject of replacing phone calls for possession and isolation with an app on a PDA.

I used to be a blue collar worker that now works in the office. This is the same as the other unrealistic solutions I put up with regularly.

So now we are going to add another device, which adds another point of failure, that needs to be maintained and monitored constantly.

What happens if that device fails? Who is paying for the expense of this upgrade and the training for the conductor and ground workers to operate and monitor this? What happens if they are distracted while troubleshooting the device and the train approaches them anyways? What happens when the blue collar worker doesn’t give a fuck about safety and turns it off because it’s annoying? This is not a simple fix and rather it adds layers of complications to the entire process.

Especially when it would just be easier to I don’t know, maybe not run so many trains back to back all the time and ensure that the track is closed off? The real issue here is that the company does not want to lose profit, so they are willing to skirt safety concerns by continuing to operate trains while they are being maintained. However every time I make an argument like this it gets shut down and some new idiot tries to recommend more technology to solve something as simple as “turn it off”.