Can unicycles be carried on Chicago public transportation, with less restrictions than bicycles?

Many forms of public transportation have limits on when/where bicycles can be carried on them. One way to stretch how far you can go is to take a unicycle. (unicycles are slower than the slowest bike, but faster than the fastest walker)

Folding bicycles are frequently purchased for use on public transportation. Unicycles are much less commonly seen, but train conductors would probably treat them similarly, especially because they both have rubber tires that may be grimy/wet/dripping. Folding baby carriages are another possible analogue (though that case explicitely involves two different riders, sometimes with two paid fares).

Metra

"Folding bicycles in protective covers are permitted on all trains at all times but should not block train aisles or doorways."

http://metrarail.com/content/metra/en/home/utility_landing/riding_metra/bikes_on_trains.html

"There is no checked baggage on Metra trains. Because of limited space, skis, non-folding carriages or other large items cannot be carried. Baggage should not block aisles or other seats."

http://metrarail.com/content/metra/en/home/utility_landing/riding_metra/riding_metra.html

(traditional bicycles can't be taken on Metra during rush hour, and there's a limit of 5 bikes per traincar)

CTA trains

"Folding bicycles are allowed on CTA vehicles at all times."

http://www.transitchicago.com/riding_cta/bike_and_ride.aspx

(traditional bicycles can't be taken on the train from 7-9am and 4-6pm)

CTA buses

There is no time limit for traditional bicycles, however, there's a maximum of 2 bikes on a bus.

Other public transit organizations that set explicit size limits

Amtrak: Carry-on baggage is limited to 28" x 22" x 14".

Portland's TriMet: Folding bikes must have wheels that are 20" or smaller.

rider reports

"I wouldn’t expect a bus driver to let me on with my big unicycle (36″ wheel, so about 36″ x 44″). I’ve had a bus driver think aloud about not letting me on with my 26″ unicycle."

"I think one key to taking a folding bike onto no-bikes-allowed public transportation is what the folded bike looks like. The less it looks like a bike, the less trouble you’ll get." (...so bring a duffel bag that can cover the whole unicycle, turning it into an oddly-shapped duffel bag and nothing more)

I've gotten word from the Portland unicycle community that TriMet is apparently cracking down on allowing folks to take their one-wheeled rides onto buses with them. ... "Thank you for the opportunity to clarify TriMet's policy on unicycles. ... unless they were a 'folding' unicycle as set forth in our rules, they would not be allowed on buses." (TriMet defines a folding bike as one with a collapsing frame that has ≤ 20" wheels)