I can no longer reproduce it either. It happened at least a dozen times in a row while I was trying different things, deleting stations, map settings, etc. But then it stopped happening with the original save and it hasn't happened again.

After loading my save from the previous night, opening the map has repeatedly crashed the game with the same error.
C:\Users\build\AppData\Local\Temp\factorio-build-yOl9XL\src\Chart\TrainStopTag.cpp(145): TrainStopTag::getStopNameOffset

Steps to reproduce.
Load save Open map Zoom out or pan ...

Please forgive my monstrosity of a factory Those trains were intentionally routed to stations which I immediately deleted. I built an excess of those trains unintentionally and am slowly reincorporating them into the stock of available trains as necessary.

Using the new train UI, selecting one set of trains consistently causes a crash.

Steps to reproduce.
* Load attached save.
* Open Train UI.
* Select the "Pod Reload -> Pod [73]" set of trains.
* Crash.