I agree: the main themes seem to me to be time and memory. The last trip on the trolley is another example of these themes, as it goes on beyond the last stop down to the lake on the overgrown rails. I loved that section.
At the same time, there is that Buddhist idea of living in the present moment and savouring it - enjoying the ice-cream for itself, not thinking about what you are going to do next. The book itself is one to savour and enjoy, not one to rush through so you can get onto the next one on your TBR list.
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