Tonight. The Biggest Little Railway in the World

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Bufferstop
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Re: Tonight. The Biggest Little Railway in the World

Postby Bufferstop » Tue Jan 09, 2018 10:55 am

There was nothing wrong with the bridge design, trusses (in this case a sort of Warren truss) are ubiquitous for bridges,


Not a Pratt truss then :roll:
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Byegad
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Re: Tonight. The Biggest Little Railway in the World

Postby Byegad » Tue Jan 09, 2018 11:27 am

I watched and on first sight of their track thought, this is going to be trouble! The whole idea is good, execution so far mediocre, except the bridge which was am accident certain to happen. . Not a good advert for our hobby, but better than nothing. As for engineering, my fully qualified and certified engineer son would weep.

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Re: Tonight. The Biggest Little Railway in the World

Postby luckymucklebackit » Tue Jan 09, 2018 11:39 am

Bufferstop wrote:
There was nothing wrong with the bridge design, trusses (in this case a sort of Warren truss) are ubiquitous for bridges,


Not a Pratt truss then :roll:


Quick - report it to the Mods - he used the "P" word, Oh Wait........... :D
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Bufferstop
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Re: Tonight. The Biggest Little Railway in the World

Postby Bufferstop » Tue Jan 09, 2018 3:03 pm

The Pratt Truss originated from Caleb and Thomas Pratt (father and son)
pratttruss.gif
pratttruss.gif (2.19 KiB) Viewed 346 times

Once had a boss we called Bob P. His poor brother was the service manager for a certain washing machine manufacturer. Esther Rantzen and the "Thats's Life" team got their teeth into him, there was a long running problem with a particular model, and they got some cheap laughs ever time the company was contacted.
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Re: Tonight. The Biggest Little Railway in the World

Postby luckymucklebackit » Tue Jan 09, 2018 3:50 pm

Never seemed to bother Pratt and Whitney :D

Jim
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Pete
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Re: Tonight. The Biggest Little Railway in the World

Postby Pete » Sun Jan 14, 2018 10:08 am

The Pratt Truss originated from Caleb and Thomas Pratt (father and son)


They patented it, did they invent it...

The interesting thing about these standard designs is that originally (in the mid- late 1800s) they were designed for ease of construction not their absolute structural properties. The original US Pratt trusses were made of wood, and iron so near impossible to work out the respective loading particularly with the knowledge and consistency of materials at that time. You just over-engineered and relied on luck that you'd made it big enough. Poor Thomas Bouch discovered this, knighted one minute disgraced the next, though side loading from winds were underestimated when the Severn Bridge was built in the 60s so we shouldn't be too quick to judge.

To end on a prosaic note:

Wie Splitter brach das Gebälk entzwei.
Tand, Tand
Ist das Gebilde von Menschenhand

Theodor Fontane

:)

My second post in years and I throw in some German poetry, you're getting you're money's worth, at this rate I'll be posting some modelling soon too :wink:

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Re: Tonight. The Biggest Little Railway in the World

Postby Suzie » Sun Jan 14, 2018 11:06 am

Pete wrote:
...To end on a prosaic note:

Wie Splitter brach das Gebälk entzwei.
Tand, Tand
Ist das Gebilde von Menschenhand

...Pete


Like splinters, the beams broke in two.
Stand, Stand
Is the structure of man's hand

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Bufferstop
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Re: Tonight. The Biggest Little Railway in the World

Postby Bufferstop » Sun Jan 14, 2018 11:25 am

Although it carries their name and Patent, what Thomas and Caleb Pratt were protecting wasn't so much the design of that particular truss but the method of constructing bridges by the combination of parts in tension and compression, but patents don't work like that.
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Dad-1
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Re: Tonight. The Biggest Little Railway in the World

Postby Dad-1 » Sun Jan 14, 2018 2:33 pm

Glad I didn't bother !

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Re: Tonight. The Biggest Little Railway in the World

Postby Pete » Sun Jan 14, 2018 5:07 pm

Like splinters, the beams broke in two.
Stand, Stand
Is the structure of man's hand


I think it's more:

Like splinters broke the beams in two
Trinkets, Trinkets
Is the creation of human hands

There's always McGonagall on the same subject:

Beautiful Railway Bridge of the Silv’ry Tay!
Alas! I am very sorry to say
That ninety lives have been taken away
On the last Sabbath day of 1879,
Which will be remember’d for a very long time..


Real poetry it rimes :wink:


...were protecting wasn't so much the design of that particular truss but the method of constructing bridges... but patents don't work like that


That's kind of what I said... :D

My comment on did they invent it was more directed to the likelihood that someone previously had come up with that combination of struts and ties and just did it because it looked nice, I don't know what the patent protected.

Still interesting stuff though.

Pete
I am eight now and I just sit and watch the news
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RAFHAAA96
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Re: Tonight. The Biggest Little Railway in the World

Postby RAFHAAA96 » Sun Jan 14, 2018 5:10 pm

Cutting triangles in a sheet of plywood does not make a trussed bridge. They probably introduced so many stress raisers into the corners with that jigsaw that it would have been stronger without the holes. The drawing of the girder pattern earlier shows how stresses are passed, via pin joints. Also it was bound to break when they bent it sideways.

I shan’t be watching any more.
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Re: Tonight. The Biggest Little Railway in the World

Postby glencairn » Sun Jan 14, 2018 6:18 pm

Well, just watched the first episode. Thirty eight minutes of twaddle. Decrying the Victorians by saying the route defeated them. Plans were often made during the Reign of Victoria. It was always the cost of building such a line that was the challenge. Eventually money became available from promoters and in 1903 It was possible to travel up the Glen from Spean Bridge to Fort Augustus on the Invergarry and Fort Augustus Railway. A pier was built there and it was possible to travel by boat to Inverness on Loch Ness.

As for the so called 'Engineers' in the programme, Heaven help us if they design anything in the future.

It was nice to see the four or five minutes of scenery and Ian Futers.

Will I watch any more programmes? Probably; if only to see the scenery. It is on record, so I can cut out the inane rubbish.

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Re: Tonight. The Biggest Little Railway in the World

Postby TheObserver » Mon Jan 15, 2018 10:46 pm

b308 wrote: .. .. ..
A couple of small moans, though, firstly why on earth are they wearing life jackets, that is H&S truly gone mad!
.. .. ..
.. .. .. I cringed as much as the next Modeller but .. .. ..


Episode 2, between 21 & 23 minutes is; well .. interesting!
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Re: Tonight. The Biggest Little Railway in the World

Postby End2end » Mon Jan 15, 2018 10:58 pm

I stand by my previous comment.... Carry on up the canal. :lol:
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Re: Tonight. The Biggest Little Railway in the World

Postby Lancastrian » Tue Jan 16, 2018 7:20 am

I must admit it makes you wonder when you watch it, but I also know that programmes aren't always what they seem. To make them more watchable and entertaining some events are 'staged' and very cleverly edited, so you don't really get the true picture.
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