# track centers

NW Mailing List nw-mailing-list at nwhs.org
Tue Aug 19 13:54:20 EDT 2014

```For track centers on curves:

TCc = TCt + (K / R)

should work for different scales and units of measure by scaling the
term "K".

For all terms in millimeters:

TT3 (1:101.6) scale, K = 4300 [corrected from previous post]

TT (1:120) scale, K = 3000

For all terms in inches:

N (1:160) scale, K = 3

TT (1:120) scale, K = 5

HO (1:87) scale, K = 9

S (1:64) scale, K = 17

O (1:48) scale, K = 30

A disclaimer. . .
I have only tested this empirically in HO scale. Your results may vary
with scale and tolerances of wheel gauge, track gauge, track centers,
and overhang.

Grant Carpenter
---
On 8/18/2014 1:22 AM, NW Mailing List wrote:
> Thanks Grant I am very grateful for your knowledge and help,
> incidentally although my British stuff is 3mm the American layout I
> want to do is actually the original American TT scale at 1:120 at 2.54
> mm to the foot so do you know the formula for that one
> Thanks and regards
> Richard
>
>
>
>
>  On Aug 17, 2014, at 5:06 PM, "NW Mailing List"
> <nw-mailing-list at nwhs.org <mailto:nw-mailing-list at nwhs.org>> wrote:
>
>> Main track centers on tangent (TCt) were 13' apart, later 14'
>> (post-war) and wider in curves. For track centers on curves (TCc) in
>> British TT (3mm) scale, try TCc = TCt + (5000 / R), where R is the
>> inside track radius (all terms in millimeters).
>>
>> Grant Carpenter
>> ---
>> On 8/16/2014 9:32 AM, NW Mailing List wrote:
>>> Bit more help please chaps if anybody can oblige. What is the
>>> minimum distance between tack centers on mainline double track
>>> Thanks and regards
>>> Richard
>>>
>>> <mailto:nw-mailing-list at nwhs.org>
>>> *Sent:* Thursday, July 31, 2014
>>> The standard tie spacing on centers was 19-1/2" for main, heavy
>>> branch, switching, and engine running tracks; 21-1/2" for light
>>> branch, switching, and engine running tracks, and heavy passing
>>> sidings and yard tracks; 23-3/4" for light passing sidings and yard
>>> tracks, and heavy industrial, shop, and storage tracks; 26-3/4" for
>>> light industrial, shop, and storage tracks; and 30-1/2" for station
>>> sidings, unimportant spurs, etc. (L-168, 1946)
>>>
>>> Standard ties measured 9"W x 7"H x 8-1/2'L (L apparently minimum,
>>> not nominal).
>>>
>>> Switch ties measured 9"W x 7"H and were cut in 6" intervals from 9'
>>> to 16'L . Headblock ties varied from about 11-1/2' to 14-1/2'L,
>>> depending on the machine.
>>>
>>> Bridge ties measured 10" x 10" x 10'L (or longer where needed) on
>>> 15" centers. (L-50, 1943)
>>>
>>> Grant Carpenter
>>> ---
>>> On 7/27/2014
>>>> Hi folks
>>>> Can somebody tell me the standard tie spacing on N&W  130lb rail
>>>> please together with actual size of N&W rail ties. I am trying to
>>>> do a small TT scale project with handlaid track and need sizes to
>>>> get it right. I have ordered some drawings from the archives but I
>>>> am too impatient to wait for them to arrive in the UK
>>>> Thanks and regards
>>>> Richard
>>>
>>
>>
>> <http://list.nwhs.org/pipermail/nw-mailing-list/>
>

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