San Francisco MUNI’s F Line ex-Blackpool “boats” have swivel-head poles which have worked well on overhead designed for rigid heads (i.e., no switchable wire frogs).

Of course, SF has lots of experience with swivel heads on its hundreds of trolley buses.

pete groom
> On May 24, 2018, at 12:09 AM, Mal Rowe mal.rowe@...> wrote:

>

> On 22/05/2018 12:46 PM, Roger Greenwood wrote:

>>

>> A downside of swivel-head trolley poles was the necessity to employ switchable overhead frogs to guide the pole to the desired route. These were generally spring-loaded to favour the most-used route but for the lesser-used direction a pole-mounted lever was held by the conductor who had to make it back on board after his tram had cleared the frog.

>>

> The only place I have seen swivel heads in use on trams is in Hong Kong.

>

> A couple of pics show, firstly, the swivel head approaching a switch and secondly, the metrhod of operation of the switch - via a bit of bike chain no doubt controlled by the same circuitry as the points in the tramway.

>

> Mal Rowe - who reckons non-swivel heads work just fine for trams

>

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> <OH-switch_HongKong_Feb2015.JPG><OH_switch_HongKong_Feb2015.JPG>