Melbourne & Australian Architecture Topics

A place to talk about Australian Architecture, Heritage & Planning Issues
It is currently 29 Mar 2017, 20:08




All times are UTC + 10 hours [ DST ]


Forum rules


Please click here to view the forum rules



Post new topic Reply to topic  [ 46 posts ]  Go to page Previous  1, 2, 3, 4, 5 ... 8  Next
Author Message
PostPosted: 08 Jan 2011, 14:34 
Offline
Elite Member
Elite Member
User avatar

Joined: 28 Nov 2004, 18:39
Posts: 550
Location: St Kilda Road, Melbourne
Quote:
As for the W-class trams performing "quite admirably", the ones in service (W6) are underpowered going up slight hills, and they do not have
proper brakes.


Fortunately Melbourne W trams now in service have had track brakes fitted to them. I understand they are electromagnetic and forcibly clamp down onto the track to quickly bring the tram to a halt.

_________________
http://highriser.blogspot.com.au/


Top
 Profile  
 
PostPosted: 02 Feb 2011, 22:55 
Offline
Jedi Master
Jedi Master

Joined: 15 Dec 2008, 11:07
Posts: 1328
RobinV wrote:
As for the W-class trams performing "quite admirably", the ones in service (W6) are underpowered going up slight hills, and they do not have proper brakes. If the air supply fails (i.e., a broken hose), the air brakes don't work. That is the reverse of airbrakes on trams elsewhere, where the brakes are always applied, and the air pressure is applied to release the brakes in order that the tram can move off. Should the air supply fail while the tram is moving, the brake controller is ineffective. In that event, the driver has to resort to a mechanical handbrake.

I've taken advice about this claim from a couple of tram experts, one whom drives W-class trams, and they say that the W-class trams currently in service do in fact have "proper" fail-safe brakes. When a tram is in normal operation, if the air pressure in the system drops below 40psi (e.g. because of a broken hose), the brakes are automatically applied until sufficient air pressure is returned to the system.

Only when the tram is stabled out of service, with no air in the system at all, is the park brake required to hold the car in place. However my informants tell me that it's good practice to apply the park brake when the tram is left unattended, for a toilet stop or such.


Top
 Profile  
 
PostPosted: 03 Feb 2011, 02:05 
Offline
Member
Member

Joined: 01 Dec 2010, 00:25
Posts: 44
Highriser wrote:
Quote:
As for the W-class trams performing "quite admirably", the ones in service (W6) are underpowered going up slight hills, and they do not have
proper brakes.


Fortunately Melbourne W trams now in service have had track brakes fitted to them. I understand they are electromagnetic and forcibly clamp down onto the track to quickly bring the tram to a halt.


You're right. I hadn't noticed that the City Circle trams have had track brakes fitted. The brakes are largely obscured by the under-bogie
brackets required to hold them in place. I don't know how recent
that is, nor have I been down to Chapel Street lately to see whether
those trams have had the same treatment.

This matter reminded me of the runaway tram in Swanston Street in the mid-1970s. A truck collided with a south-bound tram outside the CUB building and demolished the driver's cabin. The driver was stunned,
and the tram gathered speed down the incline. Passengers jumped off
the tram as it gathered speed. The conductor had to rush to the
rear of the tram to apply the handbrake, but did not bring the car
to a halt until it had nearly reached La Trobe Street.


Top
 Profile  
 
PostPosted: 03 Feb 2011, 11:44 
Offline
Elite Member
Elite Member
User avatar

Joined: 28 Nov 2004, 18:39
Posts: 550
Location: St Kilda Road, Melbourne
Yes RobinV, all W trams in service have them. I am not sure about the restaurant trams though. Conjures up an interesting mental image of a restaurant tram making an emergency stop and the mayhem that would ensue.

_________________
http://highriser.blogspot.com.au/


Top
 Profile  
 
PostPosted: 03 Feb 2011, 13:48 
Offline
Elite Member
Elite Member
User avatar

Joined: 30 Jan 2010, 00:54
Posts: 631
Location: Essendon
right off topic I guess, but why dont they keep, say, 20 W class trams restored to their former selves, and then renovate the 200 or so others so that they are more accessible for less able passengers, and have air conditioning, like the ones in many international cities have been, and then put them into service. They are only going to waste as it is, so at least their outward appearance would be preserved. Otherwise the way they are going they wont even have that eventually.
This would add about 30% more trams to the network, and would allow for more services!
We have only about 500 trams on the network - the same ammount Sydney had before they ripped up there far smaller network.

_________________
“We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time.” -T.S Eliot


Top
 Profile  
 
PostPosted: 03 Feb 2011, 19:23 
Offline
Moderator
Moderator
User avatar

Joined: 01 Dec 2006, 03:20
Posts: 604
drbuc wrote:
right off topic I guess, but why dont they keep, say, 20 W class trams restored to their former selves, and then renovate the 200 or so others so that they are more accessible for less able passengers, and have air conditioning, like the ones in many international cities have been, and then put them into service. They are only going to waste as it is, so at least their outward appearance would be preserved. Otherwise the way they are going they wont even have that eventually.


I'm right with you on this, drbuc, and for a long time I've thought that the mechanicals of W trams could be modernised in the name of nostalgia and retaining a most notable character icon that has a quintessential identity of Melbourne; something I don't feel that later trams have achieved to the same degree. I think you may find some people are opposed to the idea, though.

_________________
Hippopotomonstrosesquippedaliophobia is the fear of long words.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 46 posts ]  Go to page Previous  1, 2, 3, 4, 5 ... 8  Next

All times are UTC + 10 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group
Melbourne Buildings