Bogie and trailing Truck

Bogie and Trailing Truck

The bogie, which is interchangeable with that fitted to the Class 7 engines, has four wheels of 3 ft. 0 in. diameter on tread, and is carried on 'Timken' roller bearing axleboxes of the non-split cannon type. The engine weight is carried by side bolsters, and laminated springs fitted in compensating beams. Side play control of the bogie is by means of double coil springs.

The trailing truck too, is identical with that on Class 7 engines and has wheels 3 ft. 3.5 in. diameter on the tread, fitted with 'Timken' roller bearings running in outside axleboxes. The engine weight is taken at three points on the trailing truck frame, one being at pivot centre of the trailing truck, and the other two being bolsters sliding on pads on the truck frame and situated behind the centre line of the trailing truck axle. Trailing truck side play is controlled by coil springs.

Historical Notes

July 1956 report of class 6 Bissel truck stretcher fracturing same as class 7. Stronger stretcher to be fitted. Also fractures in trailing truck frame by leading pivot pin. Corrections carried out.

The class 6 and 7 trailing trucks fitted with laminated springs gave a harder ride than coil springs. The lot 242 Clans to be fitted with new design of trailing truck based on S.Region 4-6-2 loco trailing truck. This design was also to have been fitted to new class 7 Britannia's (all cancelled) and the sole Class 8, 71000.

Only one truck was made and is fitted to 71000.

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