Or maybe she just doesn't believe it's worth discarding anti-trust law over the bogeyman of the day.

The two train companies that couldn't merge can still make trains, and still sell them to whomever they want. European purchasers can still buy them. And after reading articles like this one, these two companies have a big competitive advantage: they don't include Chinese backdoors. Maybe they're small now, but if the Chinese train/bus/etc. manufacturing companies end up being blacklisted in the EU, these two companies will grow. And, better yet, there will still be some healthy competition in the space.