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Author Topic: Preserved Mallard “on off” switch.  (Read 507 times)

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Offline chrism

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Re: Preserved Mallard “on off” switch.
« Reply #15 on: September 11, 2019, 11:31:09 AM »
It is for opening and closing the streamlined "Cod's Mouth", I believe

I believe you are correct - I can see no sign of any catches, handles, etc. on the front plating, just the hinges top and bottom so there has to be a mechanism for opening it. A crank handle operated from either side, depending on access room, makes sense to me.

Offline Bealman

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Re: Preserved Mallard “on off” switch.
« Reply #16 on: September 11, 2019, 11:36:28 AM »
I'd like to thank oldbill for starting this truly educational thread!  :thumbsup: :beers:
Vision over visibility. Bono, U2.

Offline njee20

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Re: Preserved Mallard “on off” switch.
« Reply #17 on: September 11, 2019, 11:37:44 AM »
Even if it may not have even been what he was interested in!

Offline Bealman

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Re: Preserved Mallard “on off” switch.
« Reply #18 on: September 11, 2019, 11:53:13 AM »
The only Mallard in my collection is a Minitrix 1980s model.

There ain't no switch on there so I assume the op refers to the prototype!  ;)
Vision over visibility. Bono, U2.

Offline njee20

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Re: Preserved Mallard “on off” switch.
« Reply #19 on: September 11, 2019, 12:13:15 PM »
Right, but we're not discussing an on-off switch on the LH side of the loco post preservation as the OP queried, rather an recess marked open-closed, found on both sides of the loco as it exists in all conditions.

I agree it seems likely it's what was meant, but it's not confirmed.

Offline chrism

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Re: Preserved Mallard “on off” switch.
« Reply #20 on: September 11, 2019, 12:20:58 PM »
Right, but we're not discussing an on-off switch on the LH side of the loco post preservation as the OP queried, rather an recess marked open-closed, found on both sides of the loco as it exists in all conditions.

Except after the valancing was removed during the 2nd World War - the fitting behind the hole would still have been there, probably well coated in grime.

Offline njee20

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Re: Preserved Mallard “on off” switch.
« Reply #21 on: September 11, 2019, 12:24:00 PM »
Bit overly pedantic, it exists in "all valanced conditions". Fairly obvious the hole can't exist in a panel that's not there. I actually looked at some pictures of non-valanced locos to see if there was anything obvious, but it was inconclusive!

They look far better without.

Offline chrism

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Re: Preserved Mallard “on off” switch.
« Reply #22 on: September 11, 2019, 12:38:47 PM »
I actually looked at some pictures of non-valanced locos to see if there was anything obvious, but it was inconclusive!

So did I - with the same result. I suspect it was bolted to the main frames so the best part of 2 feet inboard and well and truly in shadow.

Offline Bealman

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Re: Preserved Mallard “on off” switch.
« Reply #23 on: September 11, 2019, 01:58:27 PM »
But are we agreed it's to open the door?  :hmmm:
Vision over visibility. Bono, U2.

Offline njee20

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Re: Preserved Mallard “on off” switch.
« Reply #24 on: September 11, 2019, 02:10:39 PM »
It certainly appears that way, yes.

Offline oldbill

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Re: Preserved Mallard “on off” switch.
« Reply #25 on: September 11, 2019, 02:14:56 PM »
Hi, sorry it's taken a while to get back to you all and I reckon it being a method of opening the access hatch on the nose of the engine is most likely correct, however if it is it would seem to be well disguised on photos of non preserved locos, perhaps an extra labour saving device on preserved engines where labour is not so abundant, I shall have to scrutinise more photos. Thanks for all your replies.
Peace and Love.
Pete.

Offline njee20

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Re: Preserved Mallard “on off” switch.
« Reply #26 on: September 11, 2019, 02:30:56 PM »
I believe this was probably the photo alluded to previously, which is pre-1940, and appears to show it:


Offline oldbill

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Re: Preserved Mallard “on off” switch.
« Reply #27 on: September 11, 2019, 02:36:52 PM »
As an extra to my earlier post I have just looked at pictures of earlier fully valanced A4s and yes there it is a rather small hole in the front valance just ahead of the cylinders, I think easily missed in a casual glance unless the engine was scrupulously(?) clean.
Solved!  :D
Pete.

Offline Jon898

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Re: Preserved Mallard “on off” switch.
« Reply #28 on: September 11, 2019, 03:08:00 PM »
Given the location, wouldn't it make more sense to be the control for the cylinder blow-off/warm-up valves?  The cylinders are otherwise pretty inaccessible.  Just speculation on my part.

Jon

Offline oldbill

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Re: Preserved Mallard “on off” switch.
« Reply #29 on: September 11, 2019, 03:24:25 PM »
Hi Jon, that’s a possibility but I thought controls for cylinders (drain cocks) were in the cab and pressure release valves were like the safety valves being automatic. High pressure superheated steam in this area, I expect we will find out.

Pete

 

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