On 20/04/17 15:05, 'Noel Reed'noelreed10@... [TramsDownUnder]wrote:>
> /The trams will be double ended [bi directional] so brushes would be
> in front of and behind the pick-up shoes. Would the ‘rear’ brush
> contacting a power rail still ‘alive’ cause a CB or fuse to cut power
> ? How would wear of the brushes be monitored so that they always
> contact the rail. Would they retract to avoid wear on the road surface
> and on ballasted track when the tram reaches the proper overhead
> trolley wire and *_be proved_*_to have re-lowered_ when returning to
> the APS sections on the return journey ?/
I couldn't say anything about 'proved', but watching the console of atram in Bordeaux while transitioning, there are appropriate 'animated'graphics that depict the raising or lowering of the APS shoes, and itjust doesn't flip from deployed to retracted or vis, it sits there for20 seconds or so doing a little animation of raising or lowering. Andthe indicator lamps in the control switches blink while it'stransitioning too.
Now it could be just playing a little movie file for the time themechanism is supposed to take, or it could be playing the movie in aloop till it gets feedback that the shoe is in position. Can't say. Butthe console indication definitely wasn't binary (up or down).