The management of the carriages is carried out in total by the technical team of the Railway Maintenance Center. In addition to periodic maintenance of the facilities, periodic testing of the facilities is also carried out. This means that in addition to maintenance work on the facilities, an interesting and perhaps rarely known thing is that the maintenance team also always submits a schedule for testing the carriages according to the provisions for operating railway facilities. 
The government has several railway carriages that are mandatorily managed by the Ministry of Transportation, through the Directorate General of Railways at one of its UPTs, the Railway Maintenance Center. 
The Railway Maintenance Center manages two types of carriages with a total of 96 units, consisting of 57 flat carriages and 39 open carriages. 
Both types of carriages are spread across various locations both on the islands of Java and Sumatra. Although the locations are at various points, the management is carried out remotely from the head office of the Railway Maintenance Center in Grobogan Regency, Central Java. 
Carriage maintenance activities, for example, have been carried out on the P6 schedule (six-monthly maintenance) of flat cars at the Kroya Station yard, Central Java for three days starting on Tuesday (3/12/2024). 
There are ten cars being maintained with facility numbers GD 40 15 01 to GD 40 15 10. 
The carriage maintenance work was carried out by the technical team of the Railway Maintenance Center in collaboration with partners in the railway sector.
Based on the team's report, the maintenance work followed the procedures on the maintenance checksheet and did not forget to pay attention to the K3 (Occupational Safety and Health) aspects by wearing PPE (Personal Protective Equipment). In general, there are two maintenance actions carried out, first, in the form of actions that are in the form of measurements and visual inspections of the physical components of the facilities, second, in the form of lubrication of several vital parts of the carriage. 
The inspection was carried out completely on the bogie components (carriage wheel assembly), followed by the carriage frame and body, then measuring the diameter and profile of the wheels, measuring the coupler, and also measuring the thickness of the brake block. 
Lubrication was also embedded in the coupler, then on the brake beam hinge and brake lever that rubbed, lubrication on the skamel bearings and also on the brake handles. 
At the end of the maintenance on the P6 occasion, all ten flat carriages were declared Ready for Operation (SO) in condition. Periodic maintenance is carried out in an orderly manner according to the schedule, in order to provide a guarantee of safety and security in its operation. Likewise, in parallel, six-monthly maintenance (P6) of the carriage was also reported to have been carried out in Payakabung, South Sumatra. 
The maintenance carried out above can be said to be the first screen in controlling the safety of operating facilities. Then the second layer is in the form of testing work on facilities carried out by institutions that have the competence. The testing stage of the carriage facilities is also carried out by the Railway Maintenance Center team in parallel. Such as the testing of nineteen state-owned open carriage facilities at the Cipinang Depot. The activity lasted for four days, from November 26 to 29, 2024.
The Open Carriage at the Cipinang Depot has a facility number code of GB 35 09 01 to GB 35 09 09 and a facility number of GB 35 12 01 to GB 35 12 10.
The testing work was carried out by the Testing Team from the Railway Testing Center which has the mandate for that. Meanwhile, the Railway Maintenance Center Team as the manager of the carriage, also participated in the implementation of the carriage testing in the field.
According to the report contained in the Minutes of the test results, the carriage testing stage was carried out in two stages, the first was the static testing stage, the second was the dynamic testing stage.
Static testing was carried out on the first day when the carriage was being stabilized. There were several test items carried out according to the procedure, including testing the dimensions of the facility in the form of standard carriage sizes, then testing the boundary space of the facility, then weight testing, braking testing, cracking testing and loading testing. Testing activities were carried out using tools to obtain valid test numbers.
The testing was continued on the second day, with a dynamic testing agenda. Unlike static testing, the carriage facility was moved on a specified track. For the treatment of the carriage, braking tests can be carried out while the carriage is moving, then temperature testing, then vibration testing while moving, and loading testing. Both types of tests above were carried out carefully by the Testing Team. The results of the test found that all nineteen open carriages were declared "compliant". This means that the facilities have complied with the specified test parameters and passed the facility's feasibility test. Thus, the open carriage facilities meet the safety criteria for operation on railway lines.
Maintenance and testing work on state-owned carriages managed by the Railway Maintenance Center shows that the Center manages SMN in its entirety. All of these treatments aim to provide a sense of security in operating the facilities, as well as providing safety assurance when the facilities are used. (yogo)