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Generally speaking, the bogie wagons were custom-built for the job, while the fixed-wheel variants were cut down from former open wagons. Loadings would be placed on the deck and, if necessary, protected with tarps, then secured to the wagons with chains or rope connecting to lashing rings along the side of the wagon frames.
As bogie vehicles became more popular, VR decided to expand the concept into freight transport. The ideal choice for experimentation was a little-used, but very important class of wagon, used for ballasting the track but otherwise having little to no use. As a result, a prototype bogie ballast wagon entered service in 1901, classed NN 1.
The 100 wagons were built over about a year, and they entered service as either the BB or BP classes depending on the available bogies. BB wagons eventually included 22-29, 39, 41, 43-46, 49, 52 and 57-60. By late 1959 the entire fleet had been upgraded and reclassed as BP, except BB29 and BB45 which were altered in early 1960.
The N prefix is for "narrow" gauge, and the suffix indicating that it is a bogie wagon much like NUU, NTT, etc. above. However, unlike those examples, it is likely that the Victorian Railways would have retained the "NNN" code instead of simplifying to "NN", because there was already a broad-gauge ballast vehicle of that classification.
A bogie in the UK, or a railroad truck, wheel truck, or simply truck in North America, is a structure underneath a railway vehicle (wagon, coach or locomotive) to which axles (hence, wheels) are attached through bearings. In Indian English, bogie may also refer to an entire railway carriage. [4]
Flat wagons of Class Rilns 654 with tarpaulin hood without stanchions. The exclusively four-axle bogie wagons of Class R are equipped with a solid, level deck, usually made of wood, and, unless indicated otherwise by the code letters, also furnished with stanchions and end walls. Most types have short, removable, swivelling stanchions.
4 Wheel Tipping open wagon Mullet: YLA Bogie Flat Wagon Octopus: YDA Bogie Ballast Hopper [2] Osprey: YKA Bogie Flat Wagon [2] A modified Salmon wagon [1] Otter: YXA Bogie Wagon [2] Used as part of a long welded rail train [1] Oyster: ZUP 4 Wheel Brake Van with Ballast Ploughs Parr: YMA / YQA Bogie Flat Wagon [2] Perch: YEA Bogie Flat Wagon
Notably, one wagon (600 RY, built in 1931 as 600 IZ) was billed as first "all welded" in the world. However, since welded bogie wagons were built in part from the late 1920s in North America (although in Europe and the UK, wood and rivet construction were normal), perhaps "all welded four wheel wagon" was more applicable.