Because of that, railway companies finally moved green meaning go and used yellow to mean warn.

[diamondcutter]

At first, railway companies used red to mean stop, white to mean go, and green to mean warn. As you could imagine, trains ran into a few problems with white meaning go. For example, one train mistook a bright star for a white light and something unexpected happened. Because of that, railway companies finally moved green meaning go and used yellow to mean warn.

Source: https://zujuan.21cnjy.com/question/detail/4066060

The use of “moved green meaning go” looks odd to me. Is it correct?

 

[Rover_KE]

No.

How would you rephrase it?

 

[diamondcutter]

What about “moved green to the color meaning go”?

 

[emsr2d2]

What about “moved green to the color meaning go”?

No.

I'd say "... railway companies finally changed to system to green to mean "go", and yellow to mean "warning".

 

[Skrej]

You could say "moved green to mean go'.

 

[Phaedrus]

At first, railway companies used red to mean stop, white to mean go, and green to mean warn.

I find it odd that "stop" and "go" are not in quotation marks or in italics there, and that "warn" is being said to have been the meaning of green.

(If I commanded you, "Warn!," would you think that I was issuing you a warning or telling you to warn others?)

The meaning would seem to be either:

At first, railway companies used red to mean "stop," white to mean "go," and green to mean "be warned."

or:

At first, railway companies used red to mean to stop, white to mean to go, and green to warn people.

Because of that, railway companies finally moved green meaning go and used yellow to mean warn.

Because of that, railway companies finally decided to use green to mean to go, and yellow to warn people.