The railway from Melbourne to Sale opened in 1877 with service extended to Bairnsdale in 1887. TPO service began soon after the 1877 opening. TPO8 operated between Melbourne and Bairnsdale but by 1917 it only went as far as Traralgon. TPO9 may not have travelled as far as Bairnsdale. TPO15 and 16 were added in 1885.
Stations served include Caulfield, Beaconsfield, Pakenham, Bunyip, Drouin, Warragul, Yarragon, Trafalgar, Moe, Morwell, Traralgon, Loy Yang, Rosedale, Sale, Stratford and Bairnsdale.
TPO's 8, 9, 15 and 16 operated along this rail route.
The Early and Late Record Dates shown are those published by Purves, or otherwise confirmed to me by various TPO collectors based on inventory in their respective collections.
Rarity factors shown have been deduced from the aggregate inventory of several major collections in this field, exceeding 10,000 strikes on loose stamps and 1050 covers in total; however, the statements on relative rarity are observations only and no warranty of accuracy shall be implied.
Reference: Victoria: The Travelling Post Offices and Their Markings (1865-1912) by JWRPurves (1979