|
|
| Re: Pantograph for Trackless Trolley vs. Light Rail or MU (486704) | |||
 |
|||
| Home > SubChat | |||
|
[ Read Responses | Post a New Response | Return to the Index ] |
|
||
|
Re: Pantograph for Trackless Trolley vs. Light Rail or MU |
|
|
Posted by Robert King on Thu Sep 6 14:25:22 2007, in response to Re: Pantograph for Trackless Trolley vs. Light Rail or MU, posted by WillD on Thu Sep 6 14:12:28 2007. Both pictures show what I was getting at in my two posts. In the top one, you can see how the width of the Breda car's pantograph would short out the two trolley coach wires to the left of it, if placed directly underneath.The bottom picture shows how the trolley coach wires were strung on the outside of the streetcar wires. In Toronto, this was done so the trolley coaches could drive by streetcars without knocking poles off the positive wire but here it has to be done because the streetcars have pantographs wich would short out the trolley coach wire, meaning there's no choice about whether to use a common positive wire or not. And you can clearly see how putting two pantographs on top of the trolley coach would cause them to slide out from underneath the wires as soon as it's steered to the left or right of the wires. One would pop up outside the pair of wires and the other would short the two wires out. That's why trolley coaches always, without exception, have poles. -Robert King |
|
|
|