User:Bermicourt/K.B.Sts.B. Blatt 336

The Bavarian Class Hrz was a Bavarian goods wagon. It was a twin-axle swivelling bolster cradle wagon, registered under the engineering drawing, Sheet No. 336, in the fleet register (WV) of the Royal Bavarian State Railways (K.B.Sts.B.) for 1913. Sheet 336 incorporated two sheet numbers of the former Bavarian Eastern Railways (B.O.B.), i.e. numbers 91 and 92. This wagon class was only built without brakes.

History
In the early years of railway transportation, when wagons were still very short, special wagons were needed to transport logs - where loading lengths were greater than 6,000 mm. So-called cradle wagons were used by those individual state railway organisations involved in the transportation of logs. These wagons were characterised by a cradle in the middle of the loading area, on which the load could be placed. The wagons were always used in pairs so that the load could negotiate curves even if it was very long.

Procurement
Between 1860 and 1875 the B.O.B. procured around 308 cradle wagons of the K type. This included a second batch in 1862, 44 units according to Sheet 91 and 40 units as the third batch according to Sheet 92.

The wagons of the second series of 1862 were ordered in equal quantities from the companies of Nöll in Würzburg and Waggonfabrik Josef Rathgeber in Munich. The wagons of the third series of 1864/64 was bought in equal numbers from Klett of Nuremberg and Waggonfabrik of Josef Rathgeber.

In 1876, on the integration of the wagon fleet of the former B.O.B., wagons of the second series in the 1897 fleet register were listed under Sheet 222, the wagons of the third series under Sheet 223.

Fate
In the 1913 list, all the wagons were already annotated with the remark: "The wagons will be withdrawn from service". The retirement of the remaining wagons still in the fleet in 1913 was completed by 1915.

Underframe
The underframe of the wagons was still made of a combination of wood and structural steel. The outer longitudinal beams and all inner cross and diagonal profiles were made of iron, the buffer beams or "head pieces" were made of wood. The outer longitudinal members had a double-T profile and a height of 235 mm. In contrast with other types of underframe, there were no continuous, inner longitudinal beams on this one due to the weight of the cradle. Instead, diagonal buffer supports ran to the middle of the wagon, where they joined two reinforced crossbeams radiating to the left and right of the centre point (see wagon drawing). The wagons had screw couplings with safety bars as couplers. Due to cradle base, the drawbar was not continuous, but was led around it in an arc. It was sprung in the middle. The wagons had B.O.B. type buffers with an installation length of 612 mm. The buffer head had a diameter of 370 mm.

Undercarriage
The wagons had short, straight truss axle boxes forged from flat iron. The axles were housed in divided plain bearing axle boxes of Bavarian design. The wheels were spoked with a wheel diameter of 1,000 mm. The suspension consisted of six 1,109 mm long spring leaves with a cross-section of 96 x 13 mm.

Wagon body
The wagon body was made entirely of wood reinforced by steel bars. In the delivery version, the wagons had 730-mm-high side walls. By contrast with later designs, the centrally mounted steel cradle could not be rotated. The base of the cradle was fitted with steel serrations to prevent the load from slipping. In addition, there were safety chains with hooks that were intended to prevent the load from slipping. The two iron stanchions of the cradle were connected by tensioning chains. The floor planks were 58 mm thick.

Equipment
In addition to the two stanchions of the cradle, the wagons had four more tilting stakes to help secure the load. Each stake could also be placed in any of the eight iron stake sockets that were embedded in the wooden loading area. In the event that a pair of cradle wagons could not be coupled to one another directly because of the length of the load, there were additional chains with hooks which, looped around the load and fastened, ensured a firm connection between the wagons.

Sketches, drawings and photographs
B.O.B. Serie K 1862.jpg|View of the B.O.B. wagon in 1862 K.B.Sts.B. WV1879 Blatt 92.jpg|Sheet 92 from the 1879 fleet register K.B.Sts.B. WV1897 Blatt 222.jpg|Sheet 222 from the 1897 fleet register K.B.Sts.B. Blatt 336.jpg|Sheet 336 from the 1913 fleet register 

Wagon numbering
The following data comes from the registers of the Royal Bavarian State Railways as at 1 June 1879, 31 March 1897 and 1 March1913:

Anmerkungen / Hinweise
