The ELHS magazine The Diamond - V25 No1 2011 has a very good article by Paul Brezicki covering operations on the West End of the EL, circa 1968 - 1973. A wonderful quote from the article:
"Penn Central was like an unruly guest at a kid's birthday party, creating chaos by bullying other guests, stealing toys, and finally having to be carried out after getting sick on too much birthday cake."
Modeling the EL Mahoning Division was my original choice and planning progressed for many years with that as the goal. I finally figured out there was no way i could do it justice in the space I'd likely have at my disposal. Still a favorite though.
Steve