®i©ardo wrote:
Boltar wrote:
On 19 Jun, 22:32, wrote:
Street - Blackfriars area. AFIAA, only 33s and 73s are allowed
through the Thameslink tunnels and beyond as far as Kentish Town.

Whats the reason for the restriction , is it loading gauge or
gradiants or something else entirely?

Height of the tunnels?

ISTR it's carriage length, because of the sharp curve around St Pancras.

In article , John Rowland
writes
®i©ardo wrote:
Boltar wrote:
On 19 Jun, 22:32, wrote:
Street - Blackfriars area. AFIAA, only 33s and 73s are allowed
through the Thameslink tunnels and beyond as far as Kentish Town.

Whats the reason for the restriction , is it loading gauge or
gradiants or something else entirely?

Height of the tunnels?

ISTR it's carriage length, because of the sharp curve around St Pancras.


If I recall right, there were only certain class 31s allowed to haul the
trains through hotel curve to Kings Cross for a similar reason.

--
John Alexander,

Remove NOSPAM if replying by e-mail

John wrote:
In article , John Rowland
writes
®i©ardo wrote:
Boltar wrote:
On 19 Jun, 22:32, wrote:
Street - Blackfriars area. AFIAA, only 33s and 73s are allowed
through the Thameslink tunnels and beyond as far as Kentish Town.

Whats the reason for the restriction , is it loading gauge or
gradiants or something else entirely?

Height of the tunnels?

ISTR it's carriage length, because of the sharp curve around St
Pancras.


If I recall right, there were only certain class 31s allowed to haul
the trains through hotel curve to Kings Cross for a similar reason.

Aren't the Thameslink carriages curved in at each end to go around St
Pancras?

On 21 Jun, 05:18, "John Rowland"
wrote:
John wrote:
In article , John Rowland
writes
®i©ardo wrote:
Boltar wrote:
On 19 Jun, 22:32, wrote:
Street - Blackfriars area. AFIAA, only 33s and 73s are allowed
through the Thameslink tunnels and beyond as far as Kentish Town.

Whats the reason for the restriction , is it loading gauge or
gradiants or something else entirely?

Height of the tunnels?

ISTR it's carriage length, because of the sharp curve around St
Pancras.

If I recall right, there were only certain class 31s allowed to haul
the trains through hotel curve to Kings Cross for a similar reason.

Aren't the Thameslink carriages curved in at each end to go around St
Pancras?

Surely the clearances arn't *that* tight? Besides , didn't they
extensively rebuild that part of the tunnel in the last few years?
Perhaps they improved the clearances while they were at it and these
restrictions no longer apply.

B2003

On Thu, Jun 21, 2007 at 05:18:05AM +0100, John Rowland wrote:

Aren't the Thameslink carriages curved in at each end

No more than countless similar carriages on the rest of the network.

to go around St Pancras?

Umm, on a curve, it's the *middle* of the carriage that comes closest to
the tunnel walls, not the ends.

--
David Cantrell | Cake Smuggler Extraordinaire

I caught myself pulling grey hairs out of my beard.
I'm definitely not going grey, but I am going vain.

David Cantrell wrote:

Umm, on a curve, it's the *middle* of the carriage that comes closest
to the tunnel walls, not the ends.

Depends on the direction of the curve.

Centre and end throws exist depending on relative lengths of
wheelbase, overhang, etc.

AFAIUI most stock is designed to balance the effects of these throws.

Note that on a tight radius the passing clearance between vehicles
will be a function of both throws.

OC