In April 2019, our Ljubljana workshop completed a major overhaul of Siemens Desiro EMUs owned by the passenger operator SŽ-Potniški promet. The works, which took two and a half years to complete, started on 13 September 2016 when the first unit entered Ljubljana Center's shop, and involved a total of 30 major revisions – 10 on two-car units and 20 on three-car units.

Compared to mid-life overhauls, a major overhaul comprises more repair work on the converters of the auxiliary equipment, traction power converters, the underframe, the brakes, interior equipment, and – what is easy to notice – application of an anti-graffiti coating over the entire body, which improves the general image of the trains and is significantly faster and more environmentally friendly than redoing the whole paintwork. Additionally to the overhaul works, degraded parts of traction motor insulation were renewed, loose window panes were replaced, Wi-Fi was installed, and a prototype retractable thread board was retrofitted onto one of the EMUs for testing.

The works on the list went according to plan and were on schedule, with no additional unit downtime. Night and weekend shifts were introduced to handle the increase in workload so that the trains could be returned to operation when scheduled for service.

The next such revision is planned in 2024. Meantime, things are sure to stay lively as these trains typically require plenty of routine servicing. Moreover, a project is currently on-going to GSM-R on the EMUs.


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