Archaeologists report the discovery of a rare Roman coin dated to roughly 1,700 years ago at a railway construction site. Multiple outlets describe the coin as depicting Carausius, a Roman naval commander who leads a breakaway regime that effectively rules Britain and parts of northern Gaul. The sources say the find is being made during excavation work connected to the rail project, indicating the coin comes from material preserved in the ground at the site. Carausius’s rule is described as lasting about seven years during the third century, establishing an independent authority distinct from central Roman control. While the outlets focus on the coin’s age, rarity, and depiction of Carausius, they also underline the archaeological context provided by the railway dig. The reporting indicates that researchers are examining the artefact’s details and significance as part of ongoing work related to the excavation, but the outlets do not provide further information in these excerpts about where in the site it was found or additional inscriptions or mint details. Overall, the accounts present the coin as a notable addition to evidence about Carausius’s period in Britain.