Well despite much discussion there still haven't been cages incorporated into cab design. OK, there is a thumping great steel chassis on a 66 but it doesn't do anything to protect above solebar level - there's still only a fascia panel between the driver and the outside world.
I appreciate that the kinetic energy involved when a freight train meets a solid object is enormous, but it's worth a try deflecting it away from the traincrew. (At least when they made the 67s they used monocoque construction, which should be considerably stronger).
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