From Norton Green, the former steam route was extended beyond Thornaby to Newport, and the former horse route was extended beyond Middlesbrough Town Hall to Borough Road East.
From Middlesbrough railway station the line extended beyond Benson Street, to Roman Road.
One further extension from Middlesbrough railway station to the ferry opened on 16 August 1901.
The depot was located off Boathouse Lane at grid reference NZ 44769 18289.
The transfer of this Imperial Tramways Company concern brought to an end to Imperial's tramway interests, although the company continued in existence until it sold the Corris Railway in 1930.