New Yorks with 'two-way stretch'
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• A new range of semi-trailers designed to permit operators to take immediate advantage of changes in weight limits which may occur, has been announced by the York Trailer Co. Ltd., Corby.
The basic York tandem is now the SL32, replacing the former SL30, now withdrawn. This model covers 28, 30 and 32 ton gross combination weights and features a stronger main frame assembly than that used on the SL30. A castellated high-tensile I-beam is still used but the flange width is increased from 4in. to 6.5in.
Double vertical web stiffeners are fitted adjacent to each running gear hanger bracket and the tubular cross-members in the assembly are reinforced in a similar manner. Production rationalization has made the SL32 lower in price than the model it replaces.
A second unit, known as the SL34, is capable—when working with a suitable twoaxle tractive unit—of running at 34 tons gross with an outer axle spread of 31.15tt, as has been suggested in proposals currently being examined by the Ministry of Transport.
This model is equipped with 10-ton axles with 15.5in. by 8.25in. brakes and is mounted on 10.00-20 tyres. Because it employs a more heavily constructed main frame than the SL32. it has ample capacity for uprating when required. Extra crossmembers and stiffeners are provided so that should it become necessary or advantageous to change the axle spread or the bogie location if g.v.w. laws are changed, any York branch can complete the work at a standard price which will remain fixed for two years from the date of delivery of the vehicle. At present-day costs this figure will be £70.
The SL34 can also be supplied with widespread axles and an overall length of 40ft. when it provides for 32 tons on four axles under current C & U Regulations when coupled to suitable tractive units. It is plated for 29.25 tons gross trailer weight and will thus be suitable for 34-ton-gross operation if new regulations are made. Yet another model, the SL44C, is designed with two kingpin locations, a heavy-duty pick-up plate and an extra long neck. For present-day operation with a two-axle tractive unit it can run at up to 32 tons gross depending on the spread of the outer axles. If used with a three-axle tractor, the kingpin (which is bolted in position) can be relocated and the running gear moved back, making the trailer suitable for five-axle operation at up to 44 tons gross. Fixed alteration prices also apply to this model.
For the mixed fleet of twoand three-axle tractive units, the SL44 can be supplied with a twin retractable kingpin assembly and the York Selectalode sliding bogie. The cost of these optional extras is £54 and £252 respectively. If required for permanent operation with a three-axle tractor the SL44 is supplied with a 60in. kingpin position and a 7ft 1in. bogie spread giving a 20-ton bogie capacity.
The SL32 with a 1in. nominal thickness Keruing floor and 30ft long weighs approximately 3 tons 18cwt and this vehicle is available in lengths up to 40ft.
With the same floor specification and also at 30ft in length, the SL34 weighs 4 tons 3cwt. This vehicle is also available up to 40ft long. When supplied with the widespread bogie. the 40ft-long SL34 WS, as it is known, scales 4 tons 16cwt.
The SL44C conversion model for use under present regulations and plated to 36 tons gross train weight at 30ft overall weighs 4 tons 5cwt: when converted for operation at 44 tons g.c.w. it will weigh 4 tons 8cwt.