railroad constructions železničné stavby 6 [vynechat] railroad lines 4 [vynechat] železničné trate 4 [vynechat] history and geography 1 [vynechat] load-bearing structures 1 [vynechat] nosné konštrukcie 1 [vynechat] oceľové mosty 1 [vynechat] railroad substructure 1 [vynechat] railroad tracks 1 [vynechat] railroad transportation 1 [vynechat] railroads 1 [vynechat] steel bridges 1 [vynechat] track economy 1 [vynechat] traťové hospodárstvo 1 [vynechat] vlastiveda 1 [vynechat] železnice 1 [vynechat] železničná doprava 1 [vynechat] železničné koľaje 1 [vynechat] železničný spodok 1 [vynechat]