1,321 inhabitants and was still growing slowly. On 20 October 1811 Jean-Baptiste Bernadotte, Marshal of France and crown prince-elect of Sweden (later king Charles XIV John) took his first step on Swedish soil in Helsingborg on his journey from Paris to Stockholm. From the middle of the 19th century onwards, Helsingborg was one of the fastest-growing cities of Sweden, increasing its population from 4,000 in 1850 to 20,000 in 1890 and 56,000 in 1930 due to industrialization. From 1892 a train ferry was put in service, connecting Helsingborg with its Danish sister city Helsingør. A tramway network was inaugurated in 1903 and closed down in 1967. Following the Swedish orthography reform of 1906, the spelling of many place names in Sweden was modernized. In 1912, it was decided to use the form Hälsingborg. In preparation for the local government reform in 1971, Hälsingborg city council proposed that the new, enlarged municipality should be spelled Helsingborg; this form was adopted by the government of Sweden from 1 January 1971. In World War II, Helsingborg was among the most important drop-off points for the rescue of Denmark's Jewish population during the Holocaust. Adolf Hitler had ordered that all Danish Jews were to be arrested and deported to the concentration camps on Rosh HaShanah, the Jewish New Year which fell on 2 October 1943. When Georg Ferdinand Duckwitz, a German maritime attaché received word of the order on 28 September 1943, he shared it with political and Jewish community leaders. Using the name Elsinore Sewing Club (Danish: Helsingør Syklub) as a cover for messages, the Danish population formed an underground railroad of sorts, moving Jews away from the closely watched Copenhagen docks to spots farther away, especially Helsingør, just two miles across the Øresund from Helsingborg. Hundreds of civilians hid their fellow Danish citizens—Jews—in their houses, farm lofts and churches until they could board them onto Danish fishing boats, personal pleasure boats and ferry boats. In the span of three nights, Danes had smuggled over 7200 Jews and 680 non-Jews (gentile family members of Jews or political activists) across the Øresund, to safety in Sweden, with one of the main destinations at Helsingborg. Climate Helsingborg has an oceanic climate (Cfb) typical of southern Sweden, although its winters are very mild for a location at such a high latitude. Although the temperature differences between seasons are significant, Helsingborg often lacks a meteorological winter with