The Dutch also built a train system costing 17 million gulden as a mode for coal to be transported out from Sawahlunto through Padang. Trains have been in operation since 1888 but only recently reached Muara kalaban and later on reaching Sawahlunto in 1894. Having trains as a mode of transport brought in huge profits from the investment from only tens of thousands to hundreds of thousands tons of coal per year. Losses turned into big profits as much as 4.6 million gulden in a year in 1920. Until 1898, the coal mining business still used forced labour, known as narapaidana, who were forced to work with minimum wage. In 1908 wages for forced labour was 18 cents/day and they were subjected to whips under legal sanctions should they rebel. Wages for contract workers were 32 cents/day and they were entitled to housing facilities and healthcare facilities. Meanwhile, wages for other labourers were 62 cents/day without benefits (Zubir,1995). With that, you can picture Sawahlunto to be a prisoner camp for the forced workers in the early 20th century.