Quickest way I can think of is to move/have the file in your iCloud folder, log into iCloud on your PC and view/download (without having to install 3rd party app).
Train has no wifi and if it did it would have a lot of limitations from what I read on the ones that do. That is with all public types of wifi. Not worth using.
I think you may be out of luck, unless you use a USB cable. Connect it to your PC, and either use the Photos app, or File Explorer to view/copy the files.