The guards role was traditionally a safety one, therein lies the conundrum for the modern railway.
In the long gone days of unfitted freight and partially fitted freight the guards job was one of primarily preventing coupling snaps and train protection. Hot axle boxes and fires were far more problematic than they are today. Signaling systems were far more primitive and signalmen forgetting trains in section (causing a collision) or long sections where there was no commination with the controlling signalman, opened up the possibility of a double collision. Especially on a railway where derailments were more common because of poor vehicle or track design.
In 2016, on most lines (certainly where there DOO-P is in use) we have full track circuiting, GSM-R and CSR radio, frequent signal post telephones, multiple unit working, air brakes (mostly disc braked), invariably power operated doors, continuously welded rail and advanced vehicle suspension is the norm, virtually everyone carries a mobile phone (passenger and non-passenger)
The DOO-P system itself requires there is continuous communication with the controlling signaling centre. Alarms are sent should the driver not respond to his vigilance device (potentially triggering train stopped in section signaling regulations) PA circuits can be opened to make announcements remotely.
The result of these improvements are the guards safety role has been diminished.
While it completely understandable that staff may feel this park of their job has de-skilled, this has been made up in part by commercial duties.
Understandably, guards wish to protect their jobs (and wages) however things tend to move in they certainly have in other areas. For example there are far less shunters and wheeltappers. Station staff have had to accept the rise of ticket machines, internet purchase and so on, signalmen have had to accept power signaling and automatic route setting.
The railway is not a bubble and needs to provide value for money to the taxpayer (who supports the industry to the tune of billions per year) and farepayer and provide a useful public service. This is the situation the majority of employees in other industries face, unionised or not, subsidised or entirely self-funded. If businesses do not perform they cease to exist and jobs are lost.
Most people accept there is a very small possibility of a freak set of circumstances that may conspire to create more danger to the train. Unfortunately, statistics, facts and safety cases are not on the side of the retention of guards to prevent accidents.
Firstly, most guards, during their career will (thankfully) never carry out emergency protection. This only occurs in very exception circumstances when then controlling signalbox cannot protect trains.
Secondly the millions of pounds paid out in guards wages, would better spent on eliminating level crossings or improving station safety where statistically there is far greater chance of a fatality.
When lines are considered for reopening, or extra services are added, the staff costs are calculated. Sadly, business cases do not often add up. The result being people are forced to use less safe road transport!
It is very disingenuous of the unions to argue otherwise. They would be better of forming a working group with TOC management to formulate a commercial case to retain guards based on enhancing the customer experience or monetising their role more.
In other words, in monetary terms, providing guards does not offer good value for money/greater safety on todays railway, in fact may even diminish it in an overall context. They may have more of a commercial case taking on other roles.
At the very best the safety/performance gain is very marginal, easily countered by enhanced DOO as a result of providing pass-com communication to controllers as well as all staff (safety critical or not) could carry panic alarms with GPS co-ordinates or mobile triangulation. Dwell times tend to be increased with guard operation, and the need for guards to operate doors takes them away from commercial duties.
It is a great shame the unions choose to see railway management as people they should fight rather than working toward an innovative solution where employment and wages can be maintained. The sad reality Is many guards jobs have gone, and will continue to go in the march to modernise, just as it has with other grades. People need to have a plan B rather than using the catch-all of safety, which under closer examination holds little water and the public are becoming increasingly sceptical of.