Back in the yards

The Lady Friend and I have returned from our working adventure on the California Zephyr, and the TrainWeb report is here. The Kindle version of the ebook of Zephyr is nearly ready, and I am tearing my hair out trying to figure out how to compress the .epub file small enough to transmit to Barnes & Noble for the Nook version. There are a lot of photographs, and they take up bandwidth even when sized small. I'm sure there's a solution but I haven't found it yet.