No 78 at Thirlmere, on the day of its official unveiling,
first Sunday of March, 1998. On your page, you list No 78 as
No 1, saying that No 1 visited Thirlmere during the 1970's.
I'd suggest that No 1 hasn't been out of Sydney since mid
1877, when it was placed on shunting duties. Certainly, since
the Powerhouse Museum has had it in their custody/ownership
(since 1879) No 1 hasn't been further from the centre of
Sydney than Castle Hill, where it was extensively restored in
the early 1980's.
No 78 was constructed to the same design as No1, indeed No 78
was one of a batch of four constructed on what were originally
intended to be replacement frames for Nos 1-4. The tender
that No 78 had, whilst in service and up to 1938, was one
taken from Nos 1-4. This tender finally returned to No 1 in
1938, when No 1 was displayed in Martin Place for the
Sesqui-Centenary of settlement celebrations. No 78 received a
modified Z-24 Class tender for display at Enfield, which it
retained until 1976. This tender was too badly rusted to be
salvageable, so it was replaced with the original tender taken
from 1709 in 1964. Circa1980, the Z-17 Class tender was
replaced by a tender construced on the frames of the former
SMR Weedkiller wagon, which was originally a tender off one of
Nos 1N, 2N, or 3N (later Nos 388, 389, 390).