If you don't like 'maths', pass on this one.

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If you don't like 'maths', pass on this one.

Post  Atlas on Mon Jun 03, 2013 12:44 am

And I don't mean 'pass it on' - I mean 'PASS'.

A loco and a carriage measure in total length 16 feet including the 6" long spacer coupling.Q. What is the tightest radius, given that the carriage is on bogies, that can be laid to safely traverse both vehicles in a complete circle without de-railing.

This is for railway technical engineers only. There are no prizes on offer. No trick question and a headache for the winner. Enjoy - affraid Wink Very Happy
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Re: If you don't like 'maths', pass on this one.

Post  southernbelle on Mon Jun 03, 2013 6:32 am

Pass confused
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Re: If you don't like 'maths', pass on this one.

Post  Chill37 on Mon Jun 03, 2013 8:03 am

Atlas wrote:And I don't mean 'pass it on' - I mean 'PASS'.

A loco and a carriage measure in total length 16 feet including the 6" long spacer coupling.Q. What is the tightest radius, given that the carriage is on bogies, that can be laid to safely traverse both vehicles in a complete circle without de-railing.

This is for railway technical engineers only. There are no prizes on offer. No trick question and a headache for the winner. Enjoy - affraid Wink Very Happy

Havnt a clue- is there a reason for this question?

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Re: If you don't like 'maths', pass on this one.

Post  Hinch on Mon Jun 03, 2013 3:50 pm

God knows the answer to this one. I just buy my ticket, get on the train and hope that the permanent way gang have done their homework.
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Re: If you don't like 'maths', pass on this one.

Post  Chill37 on Mon Jun 03, 2013 4:10 pm

Is the answer 42?

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Post  past it on Mon Jun 03, 2013 8:01 pm

You need a trained mind to answer that one!

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Post  Jeanie on Mon Jun 03, 2013 10:19 pm

choo choo 32 ?

Absolutely no idea lol!
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Re: If you don't like 'maths', pass on this one.

Post  Atlas on Tue Jun 04, 2013 12:50 am

Chill37 wrote:
Atlas wrote:And I don't mean 'pass it on' - I mean 'PASS'.

A loco and a carriage measure in total length 16 feet including the 6" long spacer coupling.Q. What is the tightest radius, given that the carriage is on bogies, that can be laid to safely traverse both vehicles in a complete circle without de-railing.

This is for railway technical engineers only. There are no prizes on offer. No trick question and a headache for the winner. Enjoy - affraid Wink Very Happy

Havnt a clue- is there a reason for this question?

Yep. I don't want to kill my passengers by turfing them over the embankment. affraid

Is that a quess jeanie. affraid
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Re: If you don't like 'maths', pass on this one.

Post  Atlas on Tue Jun 04, 2013 12:51 am

Hinch wrote:God knows the answer to this one. I just buy my ticket, get on the train and hope that the permanent way gang have done their homework.

My you are a trusting fellow. Wink Wink Wink
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Re: If you don't like 'maths', pass on this one.

Post  Hinch on Tue Jun 04, 2013 10:44 am

I was once on a train that derailed. (A three-set DMU 'Red Dragon' service at Abergele and Pensarn circa 1962/3.)

I was only 12 or 13. An interesting experience. Great to sit in our green and cream British Railways camping coach in a siding at Abergele Station and watch the crane come out from Llandudno Junction to lift it back on.

I have no idea to work out the answer to your question Atlas but then I struggle counting down from 301 on the dartboard.
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Post  johnb on Tue Jun 04, 2013 1:14 pm

What gauge?
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Post  Jeanie on Tue Jun 04, 2013 9:33 pm

Atlas wrote:
Chill37 wrote:
Atlas wrote:And I don't mean 'pass it on' - I mean 'PASS'.

A loco and a carriage measure in total length 16 feet including the 6" long spacer coupling.Q. What is the tightest radius, given that the carriage is on bogies, that can be laid to safely traverse both vehicles in a complete circle without de-railing.

This is for railway technical engineers only. There are no prizes on offer. No trick question and a headache for the winner. Enjoy - affraid Wink Very Happy

Havnt a clue- is there a reason for this question?

Yep. I don't want to kill my passengers by turfing them over the embankment. affraid

Is that a quess jeanie. affraid

Yes of course it's a quess is it right ??? Very Happy
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Post  Atlas on Thu Jun 06, 2013 12:34 am

johnb wrote:What gauge?

seven and one quarter inch. Very Happy
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Re: If you don't like 'maths', pass on this one.

Post  Atlas on Thu Jun 06, 2013 12:36 am

[quote="Jeanie"][quote="Atlas"]
Chill37 wrote:
Atlas wrote:And I don't mean 'pass it on' - I mean 'PASS'.

A loco and a carriage measure in total length 16 feet including the 6" long spacer coupling.Q. What is the tightest radius, given that the carriage is on bogies, that can be laid to safely traverse both vehicles in a complete circle without de-railing.

This is for railway technical engineers only. There are no prizes on offer. No trick question and a headache for the winner. Enjoy - affraid Wink Very Happy


Is that a quess jeanie. affraid

Yes of course it's a quess, is it right ???

Very Happy affraid affraid affraid How would I know? It's not a b***** quiz! Surprised Rolling Eyes affraid

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Re: If you don't like 'maths', pass on this one.

Post  teamplayer2 on Thu Jun 06, 2013 9:11 am

It may need a bit of working out but you also have to take into account who is driving the train Jeanie. Will Atlas be driving the train? affraid
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Re: If you don't like 'maths', pass on this one.

Post  johnb on Thu Jun 06, 2013 11:33 pm

And the estimated axle load?
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Post  Atlas on Fri Jun 07, 2013 12:29 am

max - 5cwt. The load is only a consideration for possible rail spread. Given the construction much greater loads could be carried without affecting the gauge - but the occassion wouldn't arise. Very Happy
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Post  johnb on Fri Jun 07, 2013 12:35 pm

Not strictly true:

The carriage and the loco both behave as chords of a circle, which means that on cornering their centre of load moves in towards the centre of the circle, thre is a turning moment and the carriage can topple inwards.

There are lots of other issues - the effects flanging included.

By the way, are the carriage and engie on bogies or are they rigidly connected?
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Post  Atlas on Sat Jun 08, 2013 12:25 am

Agreed johnb - but we are not talking excessive weights or a circle - the form would be almost pear-shaped as in a loop thus the spread or inverse effect is almost neutralized - is it not?

The Loco is 0-6-0 with a coupling (approx 6") to a tender which is rigid 4 wheel. The carriage is again coupled to the tender with a 6" coupling. Overall total length 16ft.
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Re: If you don't like 'maths', pass on this one.

Post  Charly on Sat Jun 08, 2013 8:01 am

Why try to turn round...just reverse it Laughing
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Post  teamplayer2 on Sat Jun 08, 2013 1:34 pm

Just going round in circles Charly. What a Face
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Post  johnb on Sat Jun 08, 2013 2:58 pm

In that case the limiting factor will probably be the wheelbase of either the loco or the carriages, depending which is longer. The restriction to curve radius is the limit imposed by flanging and that is determined by the difference between the rail centres and the distance between the wheel flanges. There is probably a table somewhere in the gauge track specification.
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Post  Atlas on Sun Jun 09, 2013 1:05 am

Charly wrote:Why try to turn round...just reverse it Laughing

Not allowed charly - propelling is very restrictive and cannot be exercised unless in an emergency situation or with adequate safeguards in place. Therefore - we don't want to make a practice of it in this particular situation whereby the 'transit' system is under constant daily use - ergo - a loop.
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Post  johnb on Sun Jun 09, 2013 11:11 am

Have you considered a points bypass?
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Post  teamplayer2 on Sun Jun 09, 2013 12:19 pm

RESISTANCE OF CURVES.
Curved track increases the resistance of trains in direct proportion to the shortness of curvature. In European railways, the character of the curves is nearly always denominated by the length of radius: in this country, a railroad curve is described as of so many degrees. The degree of a curve is determined by the angle subtended at its center by a chord of 100 feet. To those who think of a curve by its radius, it may be well to explain that a curve of one degree has a radius of 5,370 feet, and the radius of any curve can be ascertained by dividing these figures by the number of degrees.

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