It was a rudimentary blue/white monochrome app where you could lay out tracks and simulate/model a railroad.
No idea what it was called.
[Thread moved to Milliways section.]
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Design your own Railroad seems to support CGA / Hercules so maybe that?
A-Train had monochrome support.
Retronautics: A digital gallery of my retro computers, hardware and projects.
Design your own railroad seems vaguely similar, but I recall it was a shareware or freeware program.
It looked a LOT like PC-Rail:
https://www.pcrail.co.uk/images/kxbig.gif
Was there a DOS version of PC-Rail?
There is a program called JB Bahn which is not black and white, although there might be a hidden option in the menus. No idea. It is a very advanced simulation of railway layouts and timetables. Early versions were DOS compatible. Newer ones are Windows releases afaik.
I had a shareware copy on a floppy disk which was DOS compatible around 20 years ago.
