With the kind permission of the Central Electric Railfan Association's Walt Keevil I am posting a couple of track maps below showing the location of various points with the Cleveland electric zone.
You can see on the East Side the NKP changed power just east of the East Cleveland station (hidden behind the label) while NYC changed power near E. 152nd Street within the Collinwood yard. Below is a enlarged map view at the Collinwood power change area.
shlustig was correct about East Cleveland. In Herb Harwood's book Invisible Giants
he explains that East Cleveland was an elevated passenger station opened in 1930 as part of the Cleveland Union Terminal project. Below is a passage from the book (used with Mr. Harwood's permission).
The East Cleveland station survived into the diesel era. Looking at system timetables, all east/west Central passenger trains operating via CUT stopped at East Cleveland until 1961 when some trains began skipping the stop. By April 1963 the station was no longer in service. However Cleveland RTA Red Line trains continued to stop there and do so up to the present. RTA calls the station Superior.