 Machinery problems were likely to delay the ships well past their intended delivery dates of 1943 – 44 . Three turbines were delivered by Brown Boveri in 1939 to Arkhangelsk for the Sovetskaya Rossiya , but the Kharkhovskii Turbogenerator Works never completed a single turbine before the German invasion in June 1941 . A prototype boiler was supposed to have been built ashore for evaluation , but it was not completed until early 1941 , which further complicated the production plan . 
 Machinery problems <a href='uninflect' title='1'><mark>were</mark></a> likely to delay the ships well past their intended delivery dates of 1943 – 44 . Three turbines <a href='uninflect' title='2'><mark>were</mark></a> delivered by Brown Boveri in 1939 to Arkhangelsk for the Sovetskaya Rossiya , but the Kharkhovskii Turbogenerator Works never completed a single turbine before the German invasion in June 1941 . A prototype boiler was supposed to <a href='been_done' title='3'><mark>have</mark></a> been built ashore for evaluation , but it was not completed until early 1941 , which further complicated the production plan . 
Machinery problems was likely to delay the ships well past their intended delivery dates of 1943 – 44 . Three turbines was delivered by Brown Boveri in 1939 to Arkhangelsk for da Sovetskaya Rossiya , but the Kharkhovskii Turbogenerator Works never completed a single turbine before the German invasion in June 1941 . A prototype boiler was supposed to done been built ashore for evaluation , but it was not completed until early 1941 , which further complicated the production plan .