Pendennis Castle

The SprinterMeister

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Posts: 665

Trundling round the SW

Re: Pendennis Castle

« Reply #15 on: October 15, 2011, 10:07:48 »

Quote from: richwarwicker on October 15, 2011, 09:33:47

A hell of a lot quicker stopping i'd imagine!

Actually completely the opposite as coaches have a higher percentage of brake force (ie the total force applied by the brake cylinders to the blocks) in relation to their overall weight. Locomotives are typically limited to 50% brake force in relation to their overall weight. Any more than this puts more heat into the tyres and wheels than they can withstand, you get spalled treads and shifted tyres.


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Trundling gently round the SW

smokey

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Posts: 1129

Re: Pendennis Castle

« Reply #16 on: October 15, 2011, 15:41:37 »

That is correct, it takes longer to stop a light Loco, than a loco & train.
Unless it's Unfitted but that type of working is in the History books.

The Big advantage Rail has over other modes of transport (ships excepted) is that due to the Very Low rolling resistance of Steel on Steel, starting can be a problem.
Applying too much power on starting and wheel slip occurs, yes it can even happen on Dry Rails.

But the reverse is also true, Braking & Stopping a train is an ART that drivers learn, apply to much Brake force and Wheels Lock, and Sliding wheels have No (or Very Very little) Brake force at all.
It's a Fact that a Sliding Train can Pick up Speed going Down Hill, even on a shallow gradiant.

SO spare a thought for Train Drivers these next few weeks as they try to get going and have to use all their wit's to stop during the annual leaf fall season. It's not a joke some crushed leafs turn into a substance like GLASS.

In Steam Days, a Wonderful advantage of the Steam Loco was the STEAM Brake, which was Far more powerful than the Vacuum Brake, applying steam on the Reverse side of the Cylinder, causing the forward motion to compress said steam, it was a constantly changing Brakeforce, (on very stroke of the piston) so wheel lock was very rare, very much the same as pumping car brakes on Icey roads.

Diesels Locos from the 1950's up to the Early 1970's didn't have this Brake available so to increase the length of Unfitted or Part fitted freight trains BR^▸ introduced the BRAKE tender, a Heavy low wagon with powerful brakes.
Oddly these Brake Tenders could run infront or behind the Loco, any pictures of said Brake tenders anyone.


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Maxwell P

Sr. Member

Posts: 116

Re: Pendennis Castle

« Reply #17 on: October 15, 2011, 18:19:29 »

deleted


« Last Edit: October 19, 2011, 18:30:57 by Maxwell P »	Logged

Brucey

Global Moderator
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Posts: 2259

Re: Pendennis Castle

« Reply #18 on: October 15, 2011, 18:20:19 »

Could someone enlighten me as to which service is 1A91 Tongue


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devon_metro

Hero Member

Posts: 5175

Re: Pendennis Castle

« Reply #19 on: October 15, 2011, 19:07:22 »

1400 Penz - Padd


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The SprinterMeister

Hero Member

Posts: 665

Trundling round the SW

Re: Pendennis Castle

« Reply #20 on: October 15, 2011, 19:55:18 »

Quote from: Maxwell P on October 15, 2011, 18:19:29

Fun and games for all aboard 1A91 yesterday. Broken rear end, Pretend GW^▸ Castle Thunderbird on the front. Spotter's heaven. Not much fun for the TM^‡ tho Undecided

Why? He didn't have to hitch 57604 on, the 57 training school did all that! Wink


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SandTEngineer

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Posts: 3485

Re: Pendennis Castle

« Reply #21 on: October 19, 2011, 21:43:53 »

Quote from: smokey on October 15, 2011, 15:41:37

Oddly these Brake Tenders could run infront or behind the Loco, any pictures of said Brake tenders anyone.

Plenty on the www http://www.lostrailwayswestyorkshire.co.uk/images/donations/Bernard%20Coomber/Calder%20Valley/English%20electric%20type%204%20(now%20class%2040)%20with%20brake%20tender%20passes%20under%20Sands%20Lane%20road%20bridge%20Mirfield%20with%20empty%20coal%20wagons%20fo.jpg


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