Update: Load completed in approximately 2 hours. Subsequent save then reload took the usual few seconds. Thanks for the tips y'all

0.001 2018-05-05 12:23:37; Factorio 0.16.41 (build 36431, win64, steam)
0.001 Operating system: Windows 10 (build 17134)
0.001 Program arguments: "C:\Program Files ...

Thanks, y'all. About to go watch Avengers so it'll have quite a while to work itself through things!

Hi, I think I've come across an infinite loop of some sort here -

I have a large train-based map. ( https://i.imgur.com/57pigiP.jpg / walkthrough album here - https://imgur.com/a/35Phn ) After updating to the latest version, it now attempts to load but gets stuck during the process.

1. What did ...