Electrical routing of what? Circuit boards? Cables and harnesses?
From what I recall Mentor Graphics for those areas required the company to create their own libraries of items and so you would have to, in large part, be trained by the using company for their standards. I don't believe it's a good fit for self-training. Unlike other programs which are usually a substitute for drafting, this is an extension of existing design experience - CAE rather than CAD.
It appears they have two separate programs for that - one designed especially for vehicles and the other one general purpose. I expect they operate much differently from each other as they went on a buying spree.
I saw that they have in their mechanical portfolio a program called CADRA which was from Adra Systems and used a copy of the interface for some much more expensive software, CADAM; they even had a custom keyboard for their dedicated workstation that included directly typed symbols of all kinds. See