What is the fine-grained topic of the following text: The western arm from Aqueduct to Coalbrookdale, via Little Dawley, Wide Waters and across Doseley terminating at Brierley Hill declined in use and was closed in 1810 when the new tramway was built from Castle Furnaces across the Lightmoor Valley to Coalbrookdale. Only return the topic.
Closure and replacement of a tramway route in Brierley Hill