How can I visually represent and make a good contrast between Mechanical Stairs and fixed stairs?

The title says pretty much it. But here a little more context:

There’s a EXIT sign I want to improve. I should look something like this:

Fixed stairs <= EXIT => Mechanical Stairs

My questions:

1) How can I represent graphically and unequivocally the two type of stairs?
2) Should I place just graphics, just text, or both to indicate them?

Answer

A good icon for stairs with cogs or arrows pointing forward will be decriptive enough.
I found the example below using google images.

enter image description here

Attribution
Source : Link , Question Author : Alejandro Veltri , Answer Author : Terry

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