Why? Because it creates a confusing mess. Some livery variation is fine, but I suspect we will end up with as another poster suggested , just slapping a logo on everything in a small corner by the door and that will be the re brand. The current ugly mish mash will continue. Good for enthusiasts perhaps, less so for creating the sense of a joined up , smart and efficient rail system.
There isn't much sign of conformity to a common brand on the state-owned railways on the continent.
Every region wants its own place in the sun with a unique brand, plus all the commercial adverts on top.
I think France has 13 TERs, Germany has 16 states/
Länder with their own operators, and Italy has 20
regioni.
Plus the city/metro systems working across their piece, all wanting to promote their control and funding powers over local service provision.
Then there are the OA operators and freight with their own brands (even if they are owned by other state railways).
Trenitalia spends a fortune sponsoring the Giro di Italia, and as part of that manages to position a lilac-coloured EMU alongside the race for TV photo-ops.
Da Catania a Fiumefreddo di Sicilia, su un convoglio con particolare livrea rosa, in occasione della quinta tappa
www.fsnews.it
All no doubt money from the public purse.
And no yellow ends in sight.