After extended operating experience on Lithuanian Railways, the AMOT “B Series” thermostatic control valves have proven suitable for installation on upgraded diesel trains. In the first round of upgrades at the Vilnus locomotive depot, the B Valves were mounted on four refitted trains and are reported to have operated efficiently for over 850,000km. In 2004 the valves were again chosen in upgrades on a further eight diesel trains and a report from Vilnus reveals that the new valves operated reliably over an average distance of 1,000,000km per locomotive.