I Class (class M before 1900) NZR type single bolster wagons

This class consisted of 200 wagons built in 1893-1894 to a design which originated in New Zealand as their class N. They were 11'-0" long and originally had a single swivelling bolster.

They arrived in two batches. Numbers 583-683 arrived in 1893 followed by 695-794 in 1894 from Bristol Carriage and Wagon Co. They were intended and used in pairs for timber traffic.

In 1908/9 fifteen wagons were up-rated to carry 10 tons and may have been reclassified IX but the numbers of the wagons involved are not known.

A rather battered NS746 converted from I 746 to a flat wagon towards the end of its life.

Some of the class seem to have been sold to contractors or scrapped very early on with nine having gone before 1900. Many of the class were converted to IM class coal box wagons or replaced by new GC class open wagons in the years after the First World War. This may have been due to the construction of the QA class bogie bolster wagons just before the war and a fall in demand for timber trucks after the end of the conflict. The size of the class was gradually reduced during the thirties until only six were left in stock after 1937. However some of the written off wagons still existed as "Jetty stock" and these were reinstated from 1942 under new numbers.

Before 1900 583, 602, 608, 634, 670, 677, 735, 760, 764 written off or sold.
1909 697, 737, 738, 748, 785 sold to Smith & Timms (Port Hedland)
1911 744, 758 to PWD Carnavon
1912 618, 629 to PWD Broome
1914 604, 661, 718 temporarily to Railway Mill
1919 617, 772 replaced by new M class
1920

652, 705, 710, 756 to PWD

585, 587, 593, 596, 598, 610, 628, 644, 674, 701, 703, 706, 707, 720, 722, 761, 766, 769, 775, 784, 794 to IM

1921

589, 591, 595, 600, 606, 613, 615, 620, 623, 625, 627, 632, 635, 640, 645, 646, 648, 653, 654, 655, 657, 665, 668, 672, 699, 715, 721, 723, 725, 726, 730, 731, 733, 734, 740, 742, 746, 749, 751, 755, 759, 762, 765, 767, 768, 770, 776, 782, 783, 786, 787, 789, 792 to IM

1922 597 to IM

1923

604 destroyed at Mill

669, 788 transferred to Railway Mill

1924

590, 592, 601, 605, 609, 611, 612, 621, 624, 626, 630, 633, 637, 639, 641, 642, 643, 650, 651, 656, 660, 662, 663, 664, 666, 673, 675, 678, 679, 681, 696, 704, 708, 711, 712, 719, 727, 728, 732, 736, 741, 745, 747, 750, 763, 777, 778, 781, 793 replaced by new GC

1925 603, 790 replaced by new GC
1926 695 replaced by new GC
1927 599, 614, 659, 702, 716,773 to PWD

607 replaced by new GC

1928 588, 709, 752, 774 replaced by new GC

1929

619, 647, 698, 700, 724 to JETTY 348, 347, 343, 352, 345

616,  714 to Jetty stock (numbers not known)

746 ex IM

622 replaced by new GC

771 replaced by new M

667 replaced by new MA

1931 610, 699, 715, 721, 751 ex IM

1934

742, 767 ex IM

680, 715 written off

1935

584, 586, 636, 649, 682, 717, 729, 739, 779, 791 written off

594, 631, 638, 699 to JETTY 303, 158, 304, 155 respectively

1936

610, 661, 713, 721 written off

671, 676, 757, 780 to Harbour and lights Dept Hopetoun

1937 658, 669, 718, 754, 788 to Railway Mill and written off
1941 753 to N
1942 227, 277, 289 ex jetty wagon stock
1943

338, 339, 350, 394, 399, 458, 459, 464, 490, 492, 500, 511, 515, 522, 527 ex jetty wagon stock.

(I 492 was JETTY 352 - others not identified)

1944 274, 564, 588, 693 ex jetty stock
1947  394 written off

I 274 as shunters' float

From 1948 the bolsters were removed on the surviving wagons which were used as runners or shunter's flats. In recognition of this some were reclassified N and later NS. It is not absolutely clear whether all of the reinstated wagons were of the 11'-0" type or whether any ex type GSR wagons were reinstated. Therefore I have highlighted the "new" wagons in red in the list below which shows the fate of the class. Two of these ex jetty wagons re-used the numbers of written off I class wagons but it is not clear whether these were the same wagons reinstated under there old numbers. It seems unlikely.

1950 459, 464. 490, 515, 527 written off
1953 289, 399, 492 , 767 to N
1955 500 written off
1959 350 written off
1960 227, 339, 564 to NS
1961

511 written off

338 to NS

1962 743, 751 written off

522, 742, 746 to NS
1964 274, 458, 693 to NS
1968 588 written off
1972 277 written off

Shunters' float I-746

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