Speaking of peculiar, London has four places where trains switch between
overhead and third rail, namely Acton Central, Mitre Bridge, Drayton
Park and Farringdon/City Thameslink. I have no idea how common
pan-up-pan-down in service is globally. The 313 trains at Drayton Park
very noticeably go though a "turn-it-off-and-turn-it-back-on-again" moment.

I don't think it's that rare. In the US, the New York MTA New Haven
line commuter rail switches at Mt Vernon and the Boston MBTA transit
blue line switches near Logan Airport.

For added confusion, Penn Station in New York has both third rail and
OHLE, on different services but sometimes on the same tracks.

R's,
John