trade. 1800s to 1950 Södertälje already had a port, but during the 19th century it became necessary to extend it to be able to receive larger vessels. In 1819 the Södertälje Canal was inaugurated after 13 years of construction. Just over forty years later, in 1860, rail traffic between Södertälje and Stockholm commenced. The Western Main Line for trains between the east and west coast of Sweden opened in 1862, with a station in the city. Around this time Södertälje became known as a seaside resort for Stockholmers. In 1849 the Södertälje Bathing Facilities in Badparken park was opened, with both a cold bath facility and a hot bath house. The bathhouses and the Societetshus venue have been demolished, but the Bath hotel at Järnagatan street, Strandhotellet hotel, Stadsparken park and Villa Bellevue still remain from the resort era, which lasted for almost a hundred years until 1945. The tradition of selling the local pretzels, , is several hundred years old. They had their heyday during the resort era, i.e. around the beginning of the 19th century onwards. They were typically sold by older women, often referred to as (English: Pretzel ladies). The pretzels were primarily sold to tourists, especially at the city's railway stations. The sale of pretzels, among other aspects of the resort town, was described in the magazine (English: Swedish Family Journal) in 1881. By the 1900s, Södertälje's population had grown to over 8,000 people. Around the turn of the century several large factories were established in the city: Svenska Centrifug AB (1896), AB Södertelge Verkstäder (1897), Baltic (1906), Aktiebolaget Astra Apotekarnes Kemiska Fabriker (Astra) (1913), Tobaksmonopolet (1915) och Wedaverken (1917). Perhaps most interesting is the formation of VABIS, Vagnfabriks-Aktiebolaget in Södertelge (1891). In 1911 it merged with Scania and formed Scania-Vabis. Nowadays, however, the company only uses the name Scania AB. From 1950 until today In the 1950s, conditions in Södertälje's central parts were considered outdated. As the city grew, and modern apartment buildings were constructed in the outskirts, the city centre was still predominantly consisted of relatively small wooden houses. Hence, the city council decided on a major renovation of the central areas, where many buildings around the pedestrian section of Storgatan high street (including adjacent Nygatan and Köpmangatan streets) were demolished. Some of the buildings were moved to the Torekällberget City Museum. However, many of the 17th–19th century buildings around Olof Palmes plats, Marenplan,