sentences:  The eastern bridge, the older of the two and still often referred to as Årstabron ("The Årsta Bridge"), is still in operation almost 80 years after its inauguration in 1929.When projected in the early 1920s, an agreement between the state and the city stipulated the arterial railway passing through the city had to be made independent of the sea route passing beneath it.It was therefore decided that the railway should be relocated to a bridge passing over Årsta holmar, with a horizontal clearance of 26 metres ensured by a bascule bridge over the northern passage, and a truss arch bridge (The truss is the old one) over the southern passage offering a span of 100 metres.