The Victorian Railways J class was a branch line steam locomotive operated by the Victorian Railways (VR) between 1954 and 1972. A development of the successful Victorian Railways K class 2-8-0, it was the last new class of steam locomotive introduced on the VR. Introduced almost concurrently with the diesel-electric locomotives that ultimately superseded them, the locomotives were only in service for a relatively short time.

History

During the early 1950s, the Victorian Railways (VR) embarked on a massive upgrading of its ageing locomotive fleet as part of Operation Phoenix, an £80 million program to rebuild a network badly run down by years of underinvestment during the Great Depression, and the heavy workload imposed by World War II. Victoria's branch line railway network, laid with 60 lb/yd rail and featuring gradients of up to 1 in 30 (3.33%), was still largely served by the D1, D2 and D3 variants of the once 261-strong 1902-era Dd class 4-6-0 which, by the early 1950s, were at the end of their life. The new J class locomotives were supplemented by 53 K class locomotives, some of which had been built as recently as 1946. Although highly successful, K class locomotives were unsuitable for conversion from to in the event of the Victorian network being standardised, and VR policy was for all new locomotives to be engineered for easy conversion. Consequently, the building of further K class was not a feasible option. With mainline electric and diesel-electric locomotives already on order, the VR design team opted for an updated, gauge-convertible K class, which would turn out to be their final steam locomotive design.

Design features

The key problem with the K class design was the placement of the firebox between the locomotive frame and rear driving wheels, making conversion to a narrower gauge impossible without a radical redesign of the firebox. A previous attempt to develop a gauge-convertible K class, the N class, utilised a 2-8-2 wheel arrangement and positioned the firebox above the frames and behind the driving wheels. However, the extra length of those locomotives (being a total 67 ft long) made them unsuitable for a number of branch lines where only a 50 or turntable was available. The J class adopted an alternative approach to the problem by employing a high-set boiler (with the boiler centre 9 ft above rail level, compared with 8 ft for the K class ) setting the firebox above the frames and driving wheels, and retaining the K class' short wheelbase. The J class also featured a number of other design advances over the K class. It had a larger grate, enabling grate sections to be compatible with those of the N class and permitting an increase in firebox volume sufficient to allow two arch tubes to be installed. Another innovation was the use of a regulator valve incorporating a centrifugal steam separator (to draw away any water and thus provide the driest steam), rather than the simpler (though extremely reliable) D regulator valve used in the K class. The J class also featured substantially redesigned cylinder porting to improve steam flow and efficiency. The innovative SCOA-P type driving wheel centre developed for the Victorian Railways R class was adapted for the 55 in diameter J class drivers. The high-set boiler, together with the German-style smoke deflectors, gave the J class a distinctly European appearance.

Production

A total of fifty J class locomotives were initially ordered from the Vulcan Foundry in Lancashire, England. However, the VR reassessed its motive power requirements and opted to sell 10 of its brand-new, second-generation N class locomotives to the South Australian Railways, and increased the J class order to 60. At the time of order, the per-unit cost of the locomotives was £36,000 ($72,000) each. With fluctuating oil prices and an unreliable supply of coal in the early 1950s, the VR appeared to take something of a bet either way, ordering thirty of the class as coal burners and thirty as oil burners. By the time the contract for the J class had been awarded, the VR had already begun to receive deliveries of the B class mainline diesel-electric locomotives, and it unsuccessfully attempted to cancel the J class contract in favour of an order for branch line diesel locomotives.

Service

The J class was introduced for both passenger and goods traffic on Victoria's branch line network, with a maximum permissible speed of 45 mph (72 km/h), later raised to 50 mph (80 km/h). Dynamometer car tests showed the locomotive developed 930 hp at the drawbar at around 20–25 mph (32–40 km/h), which suited the relatively low speed limits of much of the Victorian branch line network. Coal-fired J class locomotives were the regular engine on the 09:00 Melbourne to Yarram passenger service, with other duties being from Lilydale to Warburton and local services from Spencer Street to Werribee. The oil-fired J was also pressed into service hauling the final leg of The Gippslander express from Sale to Bairnsdale. In their later years, J class locomotives also ran the Horsham to Dimboola leg of the morning service from Melbourne, one of the last regular steam-hauled passenger train services in Victoria. Although J class locomotives produced the same nominal tractive effort as the K or N class, they had a slightly higher adhesive weight (and so a better factor of adhesion) and were permitted to haul heavier loads on gradients. They could be found in goods service on branch lines across the state, but were also found on mainlines, running roadside goods services. Within a year of the introduction of the J class, the T class diesel electric locomotive was also introduced. Although the VR did not publicly indicate the T was intended to replace the J class, the T class proved to be such a successful design that further orders of that locomotive class were made during the late 1950s and 1960s, and T class units gradually displaced the J class from many of the latter's normal duties.

Design Improvements

Together with the K and N classes, the J class had its boiler pressure raised in the early 1960s from 175 to 180 psi, which raised their nominal tractive effort to 29500 lbf. Following recommendations from the 1957 Australian and New Zealand Railway Conference, locomotive J546 was selected for the installation of a Laidlaw-Drew oil firing system in place of the convention weir-type burner. However, the locomotive was found to steam poorly under load using the Laidlaw-Drew system and was converted back to weir burner operation. No further locomotives were converted.

Demise

By the late 1960s, the J class was largely relegated to shunting at various country yards, with many losing their cowcatchers and gaining shunter's steps on sides of the tender. The introduction of the Y class diesel electrics saw the J class even superseded in that role and, in November 1967, J523 became the first J class to be scrapped. Scrappings continued until June 1978, with J538 the last to go. J550 holds the distinction of being the very last steam locomotive in normal revenue service on the Victorian Railways, being rostered on the 6 a.m. Bendigo pilot on 25 May 1972.

Accidents and incidents

Preservation

The J class lasted as a complete class later than any other VR steam locomotive class. By the time that J class scrapping commenced, interest in railway preservation was sufficient for eleven examples to be preserved.

Operational

Under Restoration

Static