Use the same buttons you're using to build (regular) railroads, but instead of left-clicking them, you have to either right-click them or keep your left mouse button down while dragging the mouse cursor down a bit so that a drop-down appears (been quite some years so I'm not sure which one of both is correct). This will give you the choice between railroad and monorail.
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A sickened, sensitive shadow writhing in hands that are not hands, and whirled blindly past ghastly midnights of rotting creation (Nyarlathotep, H.P. Lovecraft)
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