Railways does not work in IntelliJ IDEA

I have a hard time installing Railways plugin in IntelliJ IDEA.

I am running on Linux and I get this error:
'Plugin was not loaded.
Required plugin "com.intellij.modules.ruby" is not enabled.'

This suggests that it runs only on RubyMine. Please, help me fix this.

In the plugins list, after "successful" installation of Railways, it is displayed with red font, like this:

problem_with_railways_in_intellij.jpg

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