PKP Polskie Linie Kolejowe S.A. – Zakład Liii Kolejowych in Warsaw informs that polymer concrete weights with catalog numbers 6323-1 and 6322-1 from KUCA Sp. z o.o. were installed in 2024 on railway line No. 3, on the routes/stations: Barłogi, Żychlin – Stara Wieś, Barłogi – Koło, Kutno – Krzewie, Łowicz – Stara Wieś, and that during the period of use, i.e. until April 22, 2025, they show the same properties and form as on the day of installation.