Here you go, this was the last save before it crashed.
It was whilst I was ripping out the old rails to lay down the new Y junction at the southern entrance to the base.

Game crashed when I removed a train signal. No further info at present, will update if I can reproduce. 0.002 2019-03-05 15:00:19; Factorio 0.17.5 (build 43269, win64, steam) 0.002 Operating system: Windows 10 (version 1803) 0.003 Program arguments: "C:\Program Files (x86)\Steam\steamapps\commo...