Key reference:

• Scientific and technical activity for creation of new  designs of  trucks for freight cars/
• LTD Sofiya Invest Is:

-          The owner of  intellectual property rights for engineering designs;

-          The owner  of  patents for inventions and utility models.

Core Competence:

-          Design development of load trolleys for the new generation wagons;

-          Arangement of  acceptance tests for prototypes of load trolleys;

-          Provision for  certification tests and certification with UkrSepro;

-          Provision for performance tests of load trolleys under the new generation wagons at  the proving grounds of Ukrzaliznytsya.

Sofiya-Invest LTD is the owner of the exclusive intellectual property rights for load trolleys, models 18-4129, 18-9817.

Designs Developed by Sofiya-Invest LTD

                Load trolley model 18-4129 for the new generation of freight wagons with an axial load of 25 ton-forces.

Design philosophy

                The design of the load trolley provides for diagonal couplings, primary (over-box)  suspension provided by mounting onto adapters of metal-rubber spring. By  its dynamic indexes and a rolling characteristic, the model 18-4129 has substantial advantages over the load  trolley model 18-100. The rates of impact on rails and point switches of gondola cars on these load trolleys do not exceed allowable and recommended values, subject to the axial load  of 23,5 ton-forces. That fact allows to use the load trolley throughout the railway network of CIS countries, Latvia, Lithuania, Estonia, and  Georgia, without speed limitations in loaded and empty states.

Design philosophy

                Central spring suspension includes 9 sets of springs on each  side, the internal springs being arranged above the external springs, the design of fixed contact slippers provides for the use of wound cylindrical springs, a brake beam with a thread less mounting of blocks; the devices for even relief of blocks are provided. One-stage spring suspension, with the use of an expansion strip in the adapter design.

By its dynamic indexes and a rolling characteristic, the model 18-4129 has substantial advantages over  the load trolley model 18-100. The rates of impact  on rails and point switches of gondola cars on these load trolleys do not exceed allowable and recommended values, subject to the axial load  of 23,5 ton-forces. That fact allows to use the load trolley throughout the railway network of CIS countries, Latvia, Lithuania, Estonia and Georgia, without speed limitations in loaded and empty states.