Ensuring the appropriate maintenance of rolling stock

Based on the investigation, there is no structural fault in the Dm12 rail bus that would make it unusually vulnerable to fire. When new and after a basic overhaul, Dm12 rail buses operate for years without a fire.
First and foremost, dirty engine compartments and liquid leaks have been the cause of fires, which in turn results from wear and tear. For example, the casings in the chassis have become damaged during use so that plenty of combustible material can accumulate inside them. These systematic failures have not been addressed during maintenance. The aim has been to manage the risk by cleaning the engine compartments during the V5 maintenance carried out every 5,000 km. Due to costs, some of the V5 maintenance is carried out in railway yard conditions. In practice, however, cleaning the engine compartment during V5 maintenance in railway yard conditions cannot be done thoroughly enough during the time allocated and with the methods available.

VR-Yhtymä Oy ensures that the rolling stock is maintained in the safe condition required by the authorisation for placing in service.

The responsibility for maintaining the rolling stock does not rest only on the company that is officially responsible for its maintenance. The basic requirement for appropriate maintenance is sufficient funding by the owner of the rolling stock.

Based on the investigation, there is no structural fault in the Dm12 rail bus that would make it unusually vulnerable to fire. When new and after a basic overhaul, Dm12 rail buses operate for years without a fire.
First and foremost, dirty engine compartments and liquid leaks have been the cause of fires, which in turn results from wear and tear. For example, the casings in the chassis have become damaged during use so that plenty of combustible material can accumulate inside them. These systematic failures have not been addressed during maintenance. The aim has been to manage the risk by cleaning the engine compartments during the V5 maintenance carried out every 5,000 km. Due to costs, some of the V5 maintenance is carried out in railway yard conditions. In practice, however, cleaning the engine compartment during V5 maintenance in railway yard conditions cannot be done thoroughly enough during the time allocated and with the methods available.