Dear BloodDiamond,
I feel the same, we sold mums house last week, and like you I stood in the garden that my dad had created for her, and thought, yes, she will never see it again.
Yes, the train has departed the station, but it is going on a new route, not to nowhere. It is perhaps not the most picturesque route, but it still may have interesting things along the way.
My mum has realised that she is amongs the few in her home who are mobile, so she makes sure they all have cups of tea at tea time, and takes away their empty cups for them, and the carers told me there is one lady who sits at mum's table, that mum has taken a shine to, who has difficulty in feeding herself - and mum does it for her! The lady can manage a spoon but can't scoop the food onto it, so mum does that. So she still has a value and a role, albeit different, and she still talks to other residents, albeit sometimes rubbish, it doesn't matter, it helps them all in some small way.
The lady who sits next to mum asks the same question over and over, and mum answers the same over and over, and neither of them realise they have already done it ten times. So it gives them some pleasure. Your mum's life will be different now, but there will be plus points, I hope you find them.
Much love
Margaret