Currently doing an old CTA route for Trainz, got some dual powered (actually dual pickup, overhead wire trolley poles and outside third rail pickup shoes) cars uploaded. Question, the interurbans in Chicago were all dual power, but the CTA ran both dual power and "baldy" third rail only cars depending on the line. Lines that descended to grade level outside the city transferred from 3rd rail to overhead wire so had to use trolley poles in the 'burbs, lines that were all 3rd rail ran cars with nothing on the roof. Did the CTA ever mix the two types in regular service? Were the wires between the cars high enough gauge to handle the current in a mixed consist, for example, of two baldies and four dual cars with the four trolley poles for the dual cars providing power for the traction motors in the 3rd rail-only cars? Something like this;

Would that have ever been done as needed for extra cars in the 40s and 50s, and if so would the 3rd rail only cars been dead trailers, or could they be fed power from the dual power cars for their traction motors? I have no idea how the wiring connections work, I would assume even with modern 3rd rail only cars there would be some type of feed between cars for times when one car was going over gaps in the third rail, can't find that info at or the Illinois Railway Museum.