In a historic move, two rail unions have reached an agreement with CSX railroad for paid sick leave for its workers. The agreement, reached by the Brotherhood of Locomotive Engineers and Trainmen (BLET) and the Transportation Division of the International Association of Sheet Metal, Air, Rail and Transportation Workers (SMART-TD), is the first of its kind in the railroad industry.

The agreement, which was negotiated over the course of several weeks, will provide paid sick leave for all CSX railroad workers. It will allow workers to take up to seven days of paid sick leave a year, and will also provide for additional days for workers with chronic health conditions.

The agreement was welcomed by both unions and by U.S. Senator Bernie Sanders, who joined the rail workers in calling for paid sick leave. “This agreement is a major step forward in the fight for economic justice and will help ensure that the hardworking men and women who keep our railroads running are treated with the respect they deserve,” Sanders said in a statement.

The agreement is seen as a major victory for rail workers, who have long been advocating for paid sick leave. It is also seen as a sign of progress for the railroad industry, which has been slow to adopt policies to protect workers’ rights.

The agreement is expected to be ratified by both unions in the coming weeks, and will go into effect later this year.