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RE: [7mmnga] Re: Roof colour

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  • FRANK SHARP
    Back from hols and working through 349 e-mails. For a period the Lancashire and Yorkshire Railway, (not N.G.) mixed white lead and red oxide for goods van
    Message 1 of 19 , Nov 4, 2004
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      Back from hols and working through 349 e-mails. For a period the
      Lancashire and Yorkshire Railway, (not N.G.) mixed white lead and red
      oxide for goods van roofs...PINK! The lead in the white lead would react
      with the sulphur in the coal smoke and make lead oxide which is black,
      hence white (or Pink) roofs went grey/black, and it wasn't just 'muck',
      it wouldn't clean back to white without chemical intervention. I have
      seen a quote but cannot remember where to the effect that van roofs
      could be advantageously painted with a mixture made from the residues in
      paint cans.

      The advantage of a white lead base was that the paint was quite stiff
      and 'gooey' so it sealed holes in canvas .

      Frank

      -----Original Message-----
      From: adriangrayfr [mailto:adrian@...]
      Sent: 28 October 2004 22:47
      To: 7mmnga@yahoogroups.com
      Subject: [7mmnga] Re: Roof colour


      --- In 7mmnga@yahoogroups.com, "Michael J" <michael@p...> wrote:
      >
      > The C&BFT is a fictional 2'6" gauge railway running in south-east
      > Australia in the 1920's. It's goods stock livery is grey with black
      > ironwork. This is to contrast with the government-owned stock,
      which
      > is all oxide red. I'm looking for suggestions as to what colour to
      > paint the roof of the vans. Any thoughts?
      >
      Michael,

      You don't say what your roofs are supposed to be made of, nor how
      weathered you would like them to be.

      UK stock is often roofed with planks covered with canvas,
      waterproofed by the application of white lead compound.
      As you would expect the white lead swiftly oxidises to a mid/dark
      grey colour, with sooty flecks on a steam railway.
      The canvas can be representd on a plasticard roof by fixing a layer
      of tissue paper with solvent and then painting white for freshly
      outshopped stock, varying through grey according to age.

      Some colonial stock was similar, other examples had metal (or metal
      covered) roofs. This might be thin zinc or galvanised iron in place
      of the canvas or a plain metal roof, it might also be corrugated
      metal. These roofs could be weathered in a variety of interesting
      ways but I would suggest that, in the sunny climes of SE Australia
      they would all have started white in an attempt to reduce the effects
      of the sun on the contents of the van.

      Hope that helps,

      Adrian







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