modelling 75lb flat bottom rail?

Discuss the prototype and how to model it.
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jon price
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modelling 75lb flat bottom rail?

Postby jon price » Mon May 15, 2017 6:59 pm

I want to model some 75lb flat bottom rail (4 13/16" tall according to my manual). As far as I can work out this should be code 63. Peco make a code 60 ( 3 thou too short), Or I could have code 70 ( 8 thou too tall). No-one is likely to be taking a vernier to this once it is laid, but what will look most suitable? Does anyone have any experience of this, and any suggestions for suppliers other than Peco (code 60) or Proto876 in the US (code 70)?

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grovenor-2685
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Re: modelling 75lb flat bottom rail?

Postby grovenor-2685 » Mon May 15, 2017 7:52 pm

I would recommend the code 70, I rather think that Peco code 60 is their conductor rail which has a very skinny head.
regards

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jon price
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Re: modelling 75lb flat bottom rail?

Postby jon price » Mon May 15, 2017 9:12 pm

Thanks Keith, I will go for the code70 then. And you are probably the right person to tel me what these ?jack? thingies are that they are using in this photo:

P3010037.JPG

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Martin Wynne
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Re: modelling 75lb flat bottom rail?

Postby Martin Wynne » Mon May 15, 2017 9:18 pm

jon price wrote:I want to model some 75lb flat bottom rail (4 13/16" tall according to my manual).

Hi Jon,

BS.11 1959:

BS-75R and BS-75A 75lb flat-bottom rail is 5.1/16" tall. Scales to code 66 (0.0664").

(-R has vertical sides on the head. -A has 1:20 angled sides on the head)

(75lb bullhead is 5.1/8" tall)

Martin.
40 years developing Templot. And counting ...

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jon price
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Re: modelling 75lb flat bottom rail?

Postby jon price » Mon May 15, 2017 9:56 pm

Thanks Martin. The drawing I took notes on is not to BS standard, but is a War Department spec. which seems to be roughly the same as the BS11 1905 spec. The BS11 1922 spec matches the 1959 spec you have, but in each case the 1922 has a narrower foot that the 1905. I suspect that a lot depended on where they were obtaining their supplies. In any case I will be using what is available, so it will be code 70!

hughesp87
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Re: modelling 75lb flat bottom rail?

Postby hughesp87 » Mon May 15, 2017 10:26 pm

Jon,

One further very practical consideration here. You should also think about the width of the rail foot. I have previously used American Code 55 rail for flat bottom track in p87 and found that the rail foot was too wide to allow adjacent rails to sit alongside each other at the correct check rail and flangeway clearances. This required some filing away of part of the foot to get everything to gauge, and arguably the foot looks a little out of proportion as well.

Just something else to think about!

Regards

Geraint
Geraint Hughes
Cromford & High Peak in P4
Danish Railways in P87

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grovenor-2685
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Re: modelling 75lb flat bottom rail?

Postby grovenor-2685 » Tue May 16, 2017 7:12 am

and found that the rail foot was too wide to allow adjacent rails to sit alongside each other at the correct check rail and flangeway clearances.

That is the usual situation for all but the smallest FB rails. Applies equally to the prototype.
Regards


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