The queries are controlled by the property "Query exemplar GUID" in the exemplar, which either points to a standard Maxis query, or to a custom query, which would exist in the form of a "UI" subfile somewhere, along with one or more associated PNG files. It's in this area that you must have messed something up.
Following is the type of switch point that you'll need, taken from an RTMT station. The one change you'll have to make to the transit switch point is to change all occurrences of "el train" to "monorail," but then everything should work.
Transit Switch Point 0xE90E25A1 Uint8 76 Outside-to-Inside,North+South,Drive Car,Drive Car,Inside-to-Outside,North+South,Drive Car,Drive Car,Outside-to-Inside,North+South,Ride Bus,Ride Bus,Inside-to-Outside,North+South,Ride Bus,Ride Bus,Outside-to-Inside,North+South,Freight Truck,Freight Truck,Inside-to-Outside,North+South,Freight Truck,Freight Truck,Outside-to-Inside,North+South,Ride El Train,Ride El Train,Inside-to-Outside,North+South,Ride El Train,Ride El Train,Outside-to-Inside,All Sides,Walk,Walk,Outside-to-Inside,North+South,Ride Bus,Walk,Inside-to-Outside,All Sides,Ride Subway,Walk,Outside-to-Inside,All Sides,Walk,Ride Subway,Inside-to-Outside,North+South,Walk,Ride Bus,Outside-to-Inside,All Sides,Walk,Walk,Inside-to-Outside,All Sides,Walk,Walk,Outside-to-Inside,All Sides,Ride El Train,Walk,Inside-to-Outside,All Sides,Walk,Ride El Train,Inside-to-Outside,All Sides,Walk,Ride Subway,Outside-to-Inside,All Sides,Ride Subway,Ride El Train