Assuming you're looking at the roads, If I were being cynical I'd probably suggest the risk assessment concluded it was too dangerous for them to go out in snow . (I'll point out that is a joke) I drove to Bewdley and back yesterday and saw no gritter out in either direction and yet the A442 looked like it hadn't been treated for hours and the Bewdley bypass was like glass at the traffic lights near Sandy Lane. Despite the forecast for Friday and today the treatment seems to have been cursory, though maybe local authorities have concentrated on their priorities and the roads I used weren't among them. As for today, here in Shropshire I have somewhat over a foot of snow on my garden and drive with today's lying on top of what fell on Friday, and it it is still snowing in Telford. I don't think anyone will have taken the decision to cancel today's trains lightly but given the state of roads on Saturday morning and the continual snow throughout today I doubt it can be argued to be the wrong one for the safety of all concerned.