Agree with much of the above.
I work in the Community Rail Sector - one of the tenets of this is to bring Rail together with the Communities it serves - rail safety and education with younger folk is certainly one of the big areas that CR participates in.
I tried working with some 'additional needs' kids at a local Academy a while ago and took a Thomas train set and a box of track items in with me. The maths and science teachers quickly cottoned on with the range of activities and discussion topics that could be had with a simple train set.
In particular the group I took was employing practical geometry without initially knowing it - it was quickly realised by the participants that diameters, parallels, gradients and radii etc are an inherent part in planning and creating a model railway - especially if you want the tracks to join together properly to make a double track enclosed route (eg an extended oval).
There are efforts to bring trains to the fore as a sustainable form of transport and increasingly one at the centre of wellbeing through station adoption and volunteering. The Rail Education Network has been discussing a new badge with the Scout movement - pilot scheme at the moment - I can see an opportunity to raise an interest in model railways as part of this too - watch this space.