Air Brakes

[jamieP]

Just curiouse why do some freights use the two pipe working and others like liners only run on the one pipe system?

Jamie

 

[GB]

Are there any freights that are dual piped?

 

[jamieP]

Are there any freights that are dual piped?

Yea some stone trains air.

Jamie

 

[Broken Viking]

I presume dual-piping would be for redundancy on heavier freights (Stone, aggregate etc) wouldn't it? Ye wouldn't want one of those things running away on a gradient, after all! hock:

A little off-topic here, but these adjustments (Now removed) appeared on two warning notices attached to the maintenance shed on the Air rollercoaster at Alton Towers around 2002-2003CE... (Additions underlined)

Caution: Air brakes Tea breaks!

Caution: Air brakes. (Frequently)

 

[Harbon 1]

If its the red and yellow pipe, one (forgotten which) is the brake pipe, while the other is for hoppers with automatic opening doors, like HTA's and auto ballasters.


I think

 

[TMLB UK]

If its the red and yellow pipe, one (forgotten which) is the brake pipe, while the other is for hoppers with automatic opening doors, like HTA's and auto ballasters.


I think

Red brake pipe, yellow main res pipe.

 

[Harbon 1]

Red brake pipe, yellow main res pipe.

Ah, thanks

 

[jamieP]

If its the red and yellow pipe, one (forgotten which) is the brake pipe, while the other is for hoppers with automatic opening doors, like HTA's and auto ballasters.


I think

I thought the same but the hoppers iv looked at have a external air supply plug in point. I beleave to stop any chance of the doors being open anywhere else apart from the loading and unloading bays.

 

[Smudger105e]

Some vehicles are dual piped, for the reasons that the air supply on some vehicles is not solely for brake supply, but air can operate other systems.

And you are correct, yellow for main res (the pipe with the star valve) and red for the train pipe, not called the brake pipe these days because it was thought that passengers would not like the idea of a brake pipe parting when coaches break away. Much the same line of thought as the Deadman's being renamed the DSD.

 

[Kali]

Having a res pipe also helps with brake release timing, because you don't have to refill individual reservoirs on the train vehicles from the train pipe - which will obviously delay the train pipe building pressure.