Clearances for bridges

On Jul 17, 4:39 pm, Michael Bell <mich...@beaverbell.co.uk> wrote:
> What are the clearances for bridges and suchlike and for the boundary
> fence? Looking at the fences I get the feeling that there is some
> leeway!
>
> Michael Bell
>
> --

There are two separate issues to be considered here. The clearances
for bridges are related to the structure gauge and, on top of that,
the Design Kinematic Envelope, which represents an additional
clearance beyond the structure gauge to allow for movement of the
vehicle. The DKE varies according to linespeed and (ICBW here) type of
vehicle.

Historically, the boundary fence marked the limit of railway land
ownership, which can stretch beyond the tracks themselves, eg to the
top of a cutting or the bottom of an embankment. Furthermore, on new
railways, the boundary fence should, wherever possible, allow staff
working on the line under what are known as "Red Zone" conditions to
be able to reach a position of safety (defined as 1.25 m from the
nearest rail for linespeeds of up to 100 mph and 2 m from the nearest
rail for linespeeds 101-125 mph in the Personal Track Safety
Handbook).

The PTS Handbook defines a Green Z

On Jul 17, 6:17 pm, billetelic_ferroequinolog...@m wrote:
> On Jul 17, 4:39 pm, Michael Bell <mich...@beaverbell.co.uk> wrote:
>
> > What are the clearances for bridges and suchlike and for the boundary
> > fence? Looking at the fences I get the feeling that there is some
> > leeway!
>
> > Michael Bell
>
> > --
>
> There are two separate issues to be considered here. The clearances
> for bridges are related to the structure gauge and, on top of that,
> the Design Kinematic Envelope, which represents an additional
> clearance beyond the structure gauge to allow for movement of the
> vehicle. The DKE varies according to linespeed and (ICBW here) type of
> vehicle.
>
> Historically, the boundary fence marked the limit of railway land
> ownership, which can stretch beyond the tracks themselves, eg to the
> top of a cutting or the bottom of an embankment. Furthermore, on new
> railways, the boundary fence should, wherever possible, allow staff
> working on the line under what are known as "Red Zone" conditions  to
> be able to reach a position of safety (defined as 1.25 m from the
> nearest rail for linespeeds of up to 100 mph and 2 m from the nearest
> rail for linespeeds 101-125 mph in the Personal Track Safety
> Handbook).
>
> The PTS Handbook defines a Green

(Sorry - hit the wrong key!)

Zone as a zone of work where one of the following conditions applies:

1. All lines blocked to traffic (Safeguarded Green Zone)
2. Worksite separated from running line by temporary fencing (Fenced
Green Zone). The distances vary by linespeed and according to what
type of fence is in use.
3. Worksite at least 2 m from the running line (if supervised) or 3 m
from the running line if unsupervised (Separated Green Zone).

If these conditions cannot be met, Red Zone rules apply and lookouts
must be used. There are many areas on the railway where Red Zone
working is not permitted owing to restricted sightlines, clearances
etc. For example, there are signs on the boundary fence south of
Hitchin on the Down side stating "Red Zone Prohibited".

So in an ideal world, the boundary fence will be so located to allow
at best a separated Green Zone to be provided or at least a position
of safety under Red Zone working.

HTH.

On 17 Jul, 18:17, billetelic_ferroequinolog...@m wrote:
> Furthermore, on new
> railways, the boundary fence should, wherever possible, allow staff
> working on the line under what are known as "Red Zone" conditions  to
> be able to reach a position of safety (defined as 1.25 m from the
> nearest rail for linespeeds of up to 100 mph and 2 m from the nearest
> rail for linespeeds 101-125 mph in the Personal Track Safety
> Handbook).
>

So is the PTS Handbook out of date, or does it not apply to HS1?

Steve Adams

On 18 Jul, 12:31, Steve <st...@hatchwarren.plus.com> wrote:
> So is the PTS Handbook out of date, or does it not apply to HS1?

Does not apply: HS1 has its own rules, not necessarily the same as
those used elsewhere.

PhilD

--
<><

On Jul 18, 2:40 pm, PhilD <phildea....uk> wrote:

> Does not apply: HS1 has its own rules, not necessarily the same as
> those used elsewhere.

Is it not true to say HS1 rules are UIC rules ?

In which case they are used elsewhere, but outside UK ?

--
Nick

On 18 Jul, 15:21, D7666 <d7...@m> wrote:
> On Jul 18, 2:40 pm, PhilD <phildea....uk> wrote:
>
> > Does not apply: HS1 has its own rules, not necessarily the same as
> > those used elsewhere.
>
> Is it not true to say HS1 rules are UIC rules ?
>
> In which case they are used elsewhere, but outside UK ?


I don't know if HS1 rules = UIC rules, but I will accept that my
ending "in the UK" was written in invisible ink!

PhilD

--
<><

"PhilD" <phildeaves.uk> wrote in message
news:da3f0a5f-0cb4-4471-99c4-1b7f0f365169@r35g2000prm..com...
> On 18 Jul, 15:21, D7666 <d7...@m> wrote:
>> On Jul 18, 2:40 pm, PhilD <phildea....uk> wrote:
>>
>> > Does not apply: HS1 has its own rules, not necessarily the same as
>> > those used elsewhere.
>>
>> Is it not true to say HS1 rules are UIC rules ?
>>
>> In which case they are used elsewhere, but outside UK ?
>
>
> I don't know if HS1 rules = UIC rules, but I will accept that my
> ending "in the UK" was written in invisible ink!
>
> PhilD
>
> --
> <><
Not UIC, but SNCF/RFF LGV rules, I suspect- at least one of the people
involved in writing them was from SYSTRA. I shall enquire further- my source
for such things should be calling up from CHX very shortly. The SNCF rules
were re-written following an accident in the Morvan, west of Le Creuseot,
when a group of personnel asked for a DPT (Depeche de Protection de Travaux)
to work at the side of one line, but were unwittingly at the side of the
other. Three of the four were killed- the survivor had been closing the
gate.
Brian

Hi all

Yes, HS1 has very different rules as Brian states. No one is allowed
near the line without a possession so the concept of Red Zone does not
exist, even in low speed ares.

On the topic of bridges try searching the RSSB for GE/GN8573: Guidance
on Gauging, it is about as close as we get to a dimensioned offsets
now!

OC