tps.org.au

On checking a couple of these stamps, it is apparent that they are perf 11.8.
(This is the plain type-set series for newspapers in seven denominations that
was issued in 1901, not the parcels stamps issued from 1886 as Dave E. has
shown several years ago.)

This is exactly the perforation to expect from stamps printed in Hobart by
the Government Printer around the early 1900s and late 1890s.

As Bill says 11.8
http://www.ozrevenues.com/exhibits/v5/86.jpg

But we also have perf 11, 11.5 & 12
http://www.ozrevenues.com/exhibits/v5/87.jpg

The perf 12 (actually 11.8) is found not only on these railway newspaper stamps
inscribed T G Rys but on the locally printed Revenue overprints (Platypus type &
St George and Dragon) and as a corrective line of perforation on postage stamps
where the outer edge missed the perforation in Melbourne (Pictorials and some
Queen's head type (9d, 1/-, 10/-) in the early Federal era).

The perf 11½ on the 1d is apparently found on a Tasmanian registration label as
seen on a cover dated 1912. It seems that a perf 11½ machine was obtained by
Tasmania by early 1912 or more likely before 1912. Other values in the T G Rys
series may not exist perf 11½ since they were used less frequently than the 1d.
Most values were probably not reprinted after the initial printing of 1902.

Some time later a perf 11 machine was obtained as the 1d T G Rys is recorded
with perf 11 but the date of use is unknown. Some printings of Platypus types
were made from 1929 onwards for 1d and 9d (probably 1930) values so we ask
when and where that perf 11 machine was first obtained. Usage of perf 11 on
T G Rys stamps might be limited to the 1d as it was the most used value.

There is much to discover about these plain-looking issues. Links with various
things not intended for the railways may be useful as hinted above. We might
not be able to find much information in surviving archival records.