. The trains also included 4-axle bogie coaches with compartments and side corridor and covered gangways (Corridor trains). One such fast train route was that from Berlin to Bromberg and Danzig. In 1898, the first locomotive using superheated steam in the world, designed by Wilhelm Schmidt, was produced by the Vulkan company in Stettin for Prussian state railways (KPEV Hannover 74 S4). This opened a new age of steam locomotive development. Construction of the prototypes of superheated steam locomotive classes by Robert Garbe started in 1902. These were: S4 (PKP class Pd2) for fast trains, P6 (PKP class Oi1) per passenger trains and G8 (PKP class Tp3) for goods trains. In the same year the Malborsko–Mławska Railway (the last large private railway under Prussian rule) was nationalized. 1906 saw the continued production of famous standard superheated steam locomotive classes by Garbe in the Linke-Hofmann locomotive factory in Breslau for the Prussian state railways. 584 of S6/PKP class Pd5 were produced, of which 82 units were operated by Polish State Railways (PKP). Approximately 4000 of P8/PKP class Ok1 were produced, of which 257 were operated by PKP before World War II, and 429 after the war. One of these, Ok1-359, is currently preserved in working order at the Wolsztyn museum. Öls–Adelnau–Ostrów line In 1910, the Öls–Adelnau–Ostrów line / Oleśnica–Odolanów–Ostrów Wielkopolski line that shortened the connection between Wrocław–Łódź and Warsaw was opened. Construction of the prototype of the long series 5-axle Prussian cargo locomotive G10 (PKP class Tw1) with exchange chamber with steam locomotive P8 (PKP class Ok1) by Garbe took place the same year. Three years later, production of cargo locomotive G8.1 of the Prussian state railways (PKP class Tp4) in the F. Schichau factory in Elbing commenced. Final production figures were 5267 items (459 items by PKP). That was the second longest locomotive series in Europe. Warsaw–Vienna line In 1839, the Warsaw-Vienna Railway Company was founded as a joint stock company. In the same year it applied for a license to build the Warsaw-Vienna Railway line. Construction started in 1840, but in 1842 the company went bankrupt. The shares and property were taken over by the Government of Russian Poland in 1843 and construction continued. The first section (from Warsaw to Grodzisk Mazowiecki) was finished on 15 June 1845, and before December had reached Skierniewice. The whole line to Granica ("Border") station was completed in 1848, with a junction to