When supplying NDT equipment to the foreign customers, OKOndt GROUP also provides on-site training services upon customer's request. In August 2020 the training on how to work with the ultrasonic double rail flaw detector UDS2-73 was held for a Turkish company, practical part of which included rail testing sessions both at day and at night. Keeping all required precautions, the entire planned program was completed. In the process of training, the trolley could detect the defects of the running surface of rails and in welds, and, on the customer's request, OKOndt offered a USR-01 kit - equipment designed specially for this rail bed section testing.