There used to be a similar arrangement in the Chicago area. At East River Road on the Skokie Swift line of the CTA, there was a similar transition between third rail and catenary overhead. There was an overlap of about 1/2 mile where the pan trolleys or pantographs were raised or lowered. The Skokie Swift has since been converted to all third rail, so this transition has vanished.
On the South Shore, Wilson siding (the Ideal Section) still has the box-girder latticework catenary supports similar to those used on the North Shore's Skokie Valley line.