Bang Rak District gradually proceeded to fill up with development, and in the post-World War II period, increasing numbers of foreign businesses moved from the waterfront area into newer premises, especially along Si Lom Road. In 1963, the trams were discontinued, and the canal that ran alongside Si Lom road was filled in for its expansion, further incentivizing its development as a business street. (Many of the roads had originally been built with canals running alongside, using the excavated earth. The Paknam Railway was also discontinued, in 1960.) The Dusit Thani Hotel, the city's first high-rise building, opened in 1970, initiating a wave of high-rise construction along Si Lom and Sathon as the economy boomed through the early 1990s. While the 1997 financial crisis put an end to the boom, the economy eventually recovered, and Si Lom and Sathon remain among the most prominent of Bangkok's business districts, with the BTS Skytrain now snaking its way through rows of skyscrapers.