FGV plans, in its maintenance planning, to start the R3 type revision of the second series units (4331 to 4362) from the end of 2023, with a first forecast of 29 units (19 of five cars and 10 of four). The current maintenance plan of the S4300, indicates that the R3 must be carried out on the bogies at 1,500,480 km with a fork of ± 50,000 km, these units currently travel an average of 100,000 km per year. The revisions of type R3 on the bogies will be carried out almost entirely with FGV's own personnel, with the exception of tasks that require specific equipment and qualifications, such as maintaining the reducers, sleepers and crowns, dimensional control, NDT and painting of the frames; also to speed up the intervention tasks and given that no more personal resources are available, The maintenance service on the motor bogies of the third car of the units of five, is carried out entirely with external means.

FGV plans, in its maintenance planning, to start the R3 type revision of the second series units (4331 to 4362) from the end of 2023, with a first forecast of 29 units (19 of five cars and 10 of four). The current maintenance plan of the S4300, indicates that the R3 must be carried out on the bogies at 1,500,480 km with a fork of ± 50,000 km, these units currently travel an average of 100,000 km per year. The revisions of type R3 on the bogies will be carried out almost entirely with FGV's own personnel, with the exception of tasks that require specific equipment and qualifications, such as maintaining the reducers, sleepers and crowns, dimensional control, NDT and painting of the frames; also to speed up the intervention tasks and given that no more personal resources are available, The maintenance service on the motor bogies of the third car of the units of five, is carried out entirely with external means.