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Beautiful and interesting photo.
There are very few places where the catenary has been modified in such a way that both trolleys and pantographs can be used.
It is all much more complicated than it seems. In Brussels, there is a historic route where it is possible (Tervurenlaan) and, in addition, for the 2019 parade, the route between Legrand and the St. Mariakerk has also been completely adapted for mixed use.

Цитата (focus1965, 01.10.2020):
> There are very few places where the catenary has been modified in such a way that both trolleys and pantographs can be used.

Let me guess: Riga (not completely?), Daugavpils (completely?), Lisbon (certain parts of the network), Toronto (not sure which parts), San Francisco (F line), probably Philadelphia (not sure to which extent) as well as several museums like Skjoldenæsholm. Does anyone know better?

Цитата (Славик, 01.10.2020):
> Lisbon (certain parts of the network)

In Lisbon the main issue why poles are still used on some lines is narrow streets that lines 28 and 12 go through. There's a risk that people living on higher floors would be able to reach out the window and touch a pantograph, whereas with the trolley pole - it's far enough away.


Цитата (Славик, 01.10.2020):
> San Francisco (F line)

On market Steet, the F line uses trolley bus wire, so you can't run pantographs there. the J and T lines allow either/or operation. Other lines have been modified, and while theoretically operation on both the poles and pantos is possible, there are some breakers that may desire the poles (L, N, K, M lines).


Цитата (Славик, 01.10.2020):
> Toronto (not sure which parts)

The conversion is still in progress. Eventually it will be panto only throughout the entire network.


Цитата (Славик, 01.10.2020):
> Philadelphia

The Girard line is panto operation, the rest is trolley pole.

Quote (Славик, 01.10.2020):
> Цитата (focus1965, 01.10.2020):
> > There are very few places where the catenary has been modified in such a way that both trolleys and pantographs can be used.
>
> Let me guess: Riga (not completely?), Daugavpils (completely?), Lisbon (certain parts of the network), Toronto (not sure which parts), San Francisco (F line), probably Philadelphia (not sure to which extent) as well as several museums like Skjoldenæsholm. Does anyone know better?

I was talking about the technical aspect.

https://transphoto.org/photo/849004/?vid=9307

I know that mixed exploitation can and does happen, but I also know that it cannot happen just anywhere. On a tour of Brussels, a tram with a trolley was towed and placed in the most beautiful places for photo stops. Somebody wanted to ride it anyway (for video): it did not succeed 100 metres.
When pantographs are used, the wire has to be hung zigzagged to avoid abrasions at one point.

Цитата (focus1965, 02.10.2020):
> it cannot happen just anywhere.

Цитата (focus1965, 02.10.2020):
> When pantographs are used, the wire has to be hung zigzagged to avoid abrasions at one point.

Yep, I did know that. I just do not remember exactly which section of the catenary in every particular city allows pantograph or trolley pole operation. Thanks for the insight!

In Brussels there are 2 sections where museum trams are allowed to run with trolleys.
The first is route 44 completely except for the underground terminus. This is done on a regular basis through the tram museum.

https://transphoto.org/photo/1071082/

The second route is the last above-ground route right through the centre of Brussels, between Legrand and St. Mary's Church.
This route is only used on special occasions (e.g. bank holiday celebrations) because the trams have to be towed there.

https://transphoto.org/photo/1213928/