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A number of vessels operated passengers services (including excursions) and small freight services (eg market gardeners bring goods to market) on the Tamar from Plymouth up to Gunnislake etc. In the mid to late 1800s there was healthy business and a few operators who then were taken over and the Saltash, Three Towns and District Steamboat Company Ltd was formed as the (near) monopoly operator. 
 

Built in 1880 by W Allsup & Sons of Preston 
Length 115 ft : 101 GRT
Engine : Compound Oscillating 16 and 30 in x 30 in 
Built for the Devon & Cornwall Tamar Steam Packet Co
Sold for use at Saltash by the Three Towns & District Steamboat Co in 1893
In 1913 she was bought by the Plymouth Promenade Pier & Pavilion Company, serving until 1931

Princess Royal

Built in 1888 by Willoughby Bros at Plymouth
Length 117.6 ft : 115 GRT
Engine : Compound oscillating 17 and 32 in x 30 in
Built for William Gilbert at Saltash
Sold for use at Saltash by the Three Towns & District Steamboat Co in 1893
In 1913 she was bought by the Plymouth Promenade Pier & Pavilion Company, serving until 1927

Alexandra

Built in 1888 by W Allsup & Sons of Preston
Length  125.7 ft  :  127 GRT
Engine : oscillating  20 and 38 in x 36 in
Built for the Devon & Cornwall Tamar Steam Packet Co
Sold for use at Saltash by the Three Towns & District Steamboat Co in 1893 
In 1913 she was bought by the Plymouth Promenade Pier & Pavilion Company, serving until 1928