I'm not sure what you're getting worked up about.
I don't think anyone here has seriously suggested that they want to see into the driver's cab in order to monitor the driver. They just liked the forward view that was offered on 1st Gen DMUs - and is offered on ICE3s, DLR, T&W Metro and so on.
Well that's where a comparison with the T&W Metro proves useful - if it's something which you're worried about. Ask them and find out how often people have done that. The trains are undergoing a complete refurbishment programme and the front-end arrangement hasn't changed - which suggests to me that it's not a problem.
Evidence from various studies suggests the opposite. It's the personal and emotional conversations (like the examples I gave previously) which can be the most distracting.
http://www.smh.com.au/news/national/driven-to-distraction/2007/08/02/1185648060516.html
A number of studies have shown that using hands-free equipment is as dangerous as drink driving.
http://www.theguardian.com/science/2006/jun/30/mobilephones.uknews
http://www.dailymail.co.uk/news/art...ee-mobile-phones-dangerous-drink-driving.html
http://www.huffingtonpost.com/2013/05/22/hands-free-cell-phones-driving_n_3319227.html
So how do you get a forward facing view without seeing the driver considering a drivers cab needs access to both sides of the train and needs to fit at least 2 seats in? And do you really think that providing a forward view is worth the industry spending money on? I don't really see what is so interesting about seeing e forward view either, most if the best views in a train are I side windows anyway. All that you see infront is track and signals.
Plus this thread is about watching the driver to check they aren't using a phone, not about providing a forward facing view for the punters so I think people are talking about monitoring the driver actually.
Again, you are still only justifying this from an enthusiasts point of view...as far as I'm concerned that isn't justification for putting windows in. Unless you can provide a safety case for it then I can't see how you have a valid point. My cab is my private space and I don't like the idea of people watching me do my job, I see no reason for it whatsoever.
As for hands free kit etc, I'm not debating how safe it is on the roads, just that it is permitted and I can't see the difference between phoning someone whilst driving a train for a personal conversation and having a chat with another driver who is sitting next to me.