R1520 comments

18-May-2024 Saturday
Vienna curve on the railway (Wiener Bogen)

19-December-2023 Tuesday
Know the names of the rail according to GOST R 51685-2022

17-December-2023 Sunday
Are our specialists designing the Moscow-St. Petersburg high-speed rail line incorrectly? Problems with high speeds on railways. Legacy Spiral


v20240901