C18 later CC19 Class

Total Number of Engines Built 3
First Engine Built 1914
Last Engine Built 1914
First Engine Written Off 1956
Last Engine Written Off 1961
Number of Engines in Class on the Books as at:
31/12/10 31/12/20 31/12/30 31/12/40 31/12/50 31/12/60 31/12/67
3 3 3 3 1


These engines were originally constructed with 18″ cylinders for mail train use and designated C18 Class. The first, N°692 was built as a saturated engine but N° 693 was fitted with a Schmidt superheater and N°694 received a Robinson superheater. In December 1916, N°692 also obtained a Robinson (MLS) superheater. The engines had a narrow grate with a length of 9′ 6″, reputed to be the longest firebox on a 3′ 6″ gauge engine at that time.

They were initially principally used on the Sydney Mail between Brisbane and Toowoomba. Their range was extended to Wallangarra in April 1915, Bundaberg on North Coast Line by 1918 and Roma in 1928.

The original boilers had a large regulator dome and a smaller separate one for safety valves similar to B17 Class. All received new boilers with both the regulator and safety valves contained in a smaller dome and electric headlights in 1927. N°693 and N°694 were originally fitted with Wakefield mechanical lubricators but later received Detroit hydrostatic lubricators in 1935 and 1937 respectively. All were converted to CC19 class with fitting of 19″ cylinders. They and their derivative, the C19 Class were the largest conventional engines to run on QR.

In March 1915, N°693 was named Sir William MacGregor after the then Governor of Queensland and N°694, Lady MacGregor after his wife. N°692 did not receive a name but was often referred to as Sylvania Pankhurst after the suffragette leader.

N°694 was the first engine to run over the Drayton Deviation on 5th July 1915. This line was constructed to provide a more direct path between Toowoomba and Warwick than the old main line via Gowrie. On 5th October 1958 she worked the last passenger train over the superseded route between Gowrie and Wyreema prior to its closure.

All engines spent most of their working life in the Toowoomba district, mainly on the Main and Southern Lines.

§ Increased to 11 tons when coal capacity of tender enlarged
* Later increased to 44.1 and 11 tons by the addition of coal boards.


Ipswich – Ipswich Railway Workshops

Technical Details
 C18 No692C18 No693C18 No694CC19
Wheel Arrangement4-8-04-8-04-8-04-8-0
Cylinders (diameter x stroke) ins.18 X 2318 X 2318 X 2319 X 23
Coupled Wheels diameter ins.48484848
Rigid Wheel Base12' 6"12' 6"12' 6"12' 6"
Height over smoke stack12' 7 7/16"12' 7 7/16"12' 7 7/16"12' 7 7/16"
Axle Load10101010 §
Boiler Pressure - psi.175175175160
Heating Surface - tubes1193930896896
Heating Surface - Total sq. ft.1340131012681268
Grate Area - sq. ft.21.421.421.421.4
Weight - Adhesive40.340.340.340.38
Weight - Engine52.552.552.552.5
Weight - Tender40.*
Coal Capacity - tons7777*
Water Capacity - gallons3500350035003500
Tractive Effort - lbs. (85%)23095230952309523525
Factor of Adhesion3.
Valve GearWalschaertWalschaertWalschaertWalschaert
Westinghouse Pump10 X 10 5/810 X 10 5/810 X 10 5/810 X 10 5/8
Brake ValveNo 4No 4No 4No 4
Named Locomotives
693Sir William MacGregor
694Lady MacGregor
Class Roster