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Aus loco discussion mailing list
I was always under the impression that the then NSWGR stipulated a vented
cooling system,like the ALCOS, when in fact the Caterpillar engine requires
a pressurized one,as water then has a higher boiling point.
Cheers
Bob wrote:
Aus loco discussion mailing list
As I recall, the 49 class were somewhat unusual in that they ran a coolant
(glycol) instead of a corrosion inhibitor in their cooling system. Also
the cooling fans were on all the time unlike all other units (47 excepted)
that had thermostatically controlled fans. The 47s originally had mechanically
driven fans and these were a complete failure and were replaced by hydraulically
driven motors. 4701 was a notorious boiler that always ran hot in it's
later days with SRA and when it was restored by LVR it was discovered that
the cooling fan blades were installed upside down which sucked in air rather
that suck out the hot air! The 73s were also notorious boilers in Summer
mainly due to lack of maintenance of the cooling systems and overloading
on trip trains in their final days.
Bob
Scott Martin wrote:
Aus loco discussion mailing list
Steven
Some incidental evidence is contained
in the article on the NSW 49
class in the Jul/Aug 1981 AMRM, in which some 49 class sported a silver
painted roof as a means of passive thermal control for crew comfort
(as
opposed to active measures such as A/C).
The Silver City Comet also appears to have utilised the paintwork
as a
means of passive thermal control. The original paintwork consisted
of an
aluminium paste that had (supposed) reflective properties.
I realise it's not quite what you're looking to know, but
crew/passenger comfort is probably as important as keeping the prime
movers and equipment at an optimum temp.
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