steam

On 13 January 1897, Walkers Limited completed their first steam locomotive, with a very successful trial run to Howard and return. This engine became known as a B15 class 4-6-0 tender design, and allocated QR No. 299, Walkers Limited works No. 1. The 'B' signifies three driving axles and the '15' is the cylinder diameter in inches. The Walkers Limited design was similar to that of locomotives imported from England, but they were fitted with much-improved cabs and were the first engines built for the Queensland Railways to come ready fitted with the Westinghouse automatic brake system. Builders plates were fitted to each side of the tender as well as each cab side, and in addition, a large circular maker's plate (complete with 5 point star and the words 'Walkers Limited Engineers') was carried on the smokebox door similar to early American engines. Source: maryboroughwhistlestop.org.au/299.html

The Queensland Railways PB15 class locomotive is an old class of 4-6-0 steam engines operated by the Queensland Railways. The design resulted from a need for more powerful engines for passenger trains. The PB15 Class engine was designed by Locomotive Engineer, Henry Horniblow and LW Piggott. Per Queensland Railway's classification system they were designated the PB15 class engine, P representing they were a passenger locomotive, the B that they had three driving axles and the 15 the cylinder diameter in inches. The PB15 engines were in essence identical to the B15 class engine.[2][3][4][5] The first PB15 engines were delivered by Walkers Limited, Maryborough in December 1899. By 1912, a total of 202 engines had been built by Walkers (122), Evans, Anderson, Phelan & Co (70), Kitson & Co (20) and Toowoomba Foundry (20). They were fitted with Stephenson valve gear. In May 1918, engine no. 411 was converted at North Ipswich Railway Workshops into a tank engine, the one off member of the 6D15 class engine. In March 1922 however, due to poor performance it was converted back to its original tender form. Source: en.wikipedia.org/wiki/Queensland_PB15_class_locomotive#:~...

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