"Exposing to the right" is over exposed, what now?

On 10/18/09 14:50 , David J Taylor wrote:
"Alan Browne" wrote in message
...
[]
Good point. Are train engines (of that era) painted black or do they
get that way with age? (soot).

I think both, but you would need to ask a railway buff, which I'm not.

Cheers,
David


Many are painted black. It was utilitarion and a cost effective
way of preventing rust, and it didn't show the soot. There were some
coal fired locomotives that were painted colors. Required a lot of
washing, but presented no other issues. Some hold that a black
locomotive, radiates away excess heat in the firebox more
effectively than colors or natural metals. It's one of the half
dozen reasons why radiators on cars are painted black. There is some
science to support this reasoning.

As coal fired locomotives passed into history, newer models,
diesels and electrics, were painted company colors. Or left in
natural aluminum.

D. Peter Maus wrote:
On 10/18/09 14:50 , David J Taylor wrote:
"Alan Browne" wrote in message
...
[]
Good point. Are train engines (of that era) painted black or do they
get that way with age? (soot).

I think both, but you would need to ask a railway buff, which I'm
not.

Cheers,
David


Many are painted black. It was utilitarion and a cost effective
way of preventing rust, and it didn't show the soot. There were some
coal fired locomotives that were painted colors. Required a lot of
washing, but presented no other issues. Some hold that a black
locomotive, radiates away excess heat in the firebox more
effectively than colors or natural metals. It's one of the half
dozen reasons why radiators on cars are painted black. There is some
science to support this reasoning.

As coal fired locomotives passed into history, newer models,
diesels and electrics, were painted company colors. Or left in
natural aluminum.

FWIW, there's a "steam trains" pool on flickr with going on 20,000 images.

On 10/18/09 15:20 , J. Clarke wrote:
D. Peter Maus wrote:
On 10/18/09 14:50 , David J Taylor wrote:
"Alan wrote in message
...
[]
Good point. Are train engines (of that era) painted black or do they
get that way with age? (soot).

I think both, but you would need to ask a railway buff, which I'm
not.

Cheers,
David


Many are painted black. It was utilitarion and a cost effective
way of preventing rust, and it didn't show the soot. There were some
coal fired locomotives that were painted colors. Required a lot of
washing, but presented no other issues. Some hold that a black
locomotive, radiates away excess heat in the firebox more
effectively than colors or natural metals. It's one of the half
dozen reasons why radiators on cars are painted black. There is some
science to support this reasoning.

As coal fired locomotives passed into history, newer models,
diesels and electrics, were painted company colors. Or left in
natural aluminum.

FWIW, there's a "steam trains" pool on flickr with going on 20,000 images.

Cool, thanks.

David J Taylor wrote:
"Alan Browne" wrote in message
...
[]
Good point. Are train engines (of that era) painted black or do they
get that way with age? (soot).

I think both, but you would need to ask a railway buff, which I'm not.

Where's Tony Polson (aka "Bruce") when we need him?

D. Peter Maus wrote:
On 10/18/09 14:50 , David J Taylor wrote:
"Alan Browne" wrote in message
...
[]
Good point. Are train engines (of that era) painted black or do they
get that way with age? (soot).

I think both, but you would need to ask a railway buff, which I'm not.

Cheers,
David


Many are painted black. It was utilitarion and a cost effective way of
preventing rust, and it didn't show the soot. There were some coal fired
locomotives that were painted colors. Required a lot of washing, but
presented no other issues. Some hold that a black locomotive, radiates
away excess heat in the firebox more effectively than colors or natural
metals. It's one of the half dozen reasons why radiators on cars are
painted black. There is some science to support this reasoning.

Yes indeed. Black paint (and it does have to be chosen correctly) is a
broad spectrum "black body" that radiates away more heat as infrared
energy. However I don't know when if this was known back in the 1800's
and early 1900's.

This is why "black boxes" on airplanes are black (Other than the orange
FDR/VR) - to help get rid of heat. (OTOH boxes that radiate at each
other because of proximity lose the advantage).



As coal fired locomotives passed into history, newer models, diesels
and electrics, were painted company colors. Or left in natural aluminum.