 The ships ' propulsion system consisted of a pair of horizontal triple @-@ expansion engines , with steam supplied by four cylindrical water @-@ tube boilers . The boilers were trunked into a pair of funnels on the centerline . On her speed trials , Umbria reached a maximum of 19 knots ( 35 km / h ; 22 mph ) at 7 @,@ 400 indicated horsepower ( 5 @,@ 500 kW ) . Lombardia made 18 @.@ 4 kn ( 34 @.@ 1 km / h ; 21 @.@ 2 mph ) at 6 @,@ 010 ihp ( 4 @,@ 480 kW ) , while Etruria reached 18 @.@ 3 kn ( 33 @.@ 9 km / h ; 21 @.@ 1 mph ) at 7 @,@ 018 ihp ( 5 @,@ 233 kW ) . Liguria made 18 @.@ 1 kn ( 33 @.@ 5 km / h ; 20 @.@ 8 mph ) at 5 @,@ 536 ihp ( 4 @,@ 128 kW ) and Elba , the slowest member of the class , made 17 @.@ 9 kn ( 33 @.@ 2 km / h ; 20 @.@ 6 mph ) at 7 @,@ 471 ihp ( 5 @,@ 571 kW ) Puglia was by far the fastest , capable of steaming at a speed of 20 kn ( 37 km / h ; 23 mph ) . The ships had a cruising radius of about 2 @,@ 100 nautical miles ( 3 @,@ 900 km ; 2 @,@ 400 mi ) at a speed of 10 knots ( 19 km / h ; 12 mph ) . 
