A second engine working at the mines named Alfred was an identical engine to Atlas. It is unknown what happened to them after the Mid Sodor Railway closed.
Atlas and Alfred are both based on the Joeuf Decauville 0-4-0PT, with the cab roof removed and with shorter funnels.
Atlas was both painted brown with brass domes, the top and front of his tanks was painted black, and his ufferbeams were painted red.
- Originally, two mine engines were featured on Awdry's original Mid Sodor layout. However, only one was seen on his second layout.