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One such project conducted during the 1970s was known as the Walhalla & Thomson River Steam Tramway ; this project saw the construction of a brick station building ( since demolished ) and the acquisition of an ex-West Melbourne Gasworks steam locomotive , which is now in the possession of the Puffing Billy Railway and operated as locomotive no. 861 ( Decauville ) .
 location: Walhalla; location: Melbourne
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Walhalla, Melbourne 
Answer:
 location: Walhalla; location: Melbourne