| FS Class 744 | |
| Powertype: | Steam |
| Builddate: | 1927-9 |
| Totalproduction: | 50 |
| Uicclass: | 1'D h2 |
| Leadingdiameter: | 9602NaN2 |
| Driverdiameter: | 16302NaN2 |
| Length: | 11615frac=8NaNfrac=8 |
| Fueltype: | Coal |
| Fuelcap: | 6000kg (13,000lb) |
| Boilerpressure: | 12sigfig=3NaNsigfig=3 |
| Firearea: | 3.5m2 |
| Totalsurface: | 191.7m2 |
| Superheaterarea: | 50.5m2 |
| Cylindercount: | Two, simple |
| Cylindersize: | 600x |
| Valvegear: | Walschaerts, Caprotti |
| Maxspeed: | 800NaN0 |
| Poweroutput: | 1400sigfig=3NaNsigfig=3 |
| Tractiveeffort: | 14800sigfig=3NaNsigfig=3 |
The Ferrovie dello Stato (FS; Italian State Railways) Class 744 (Italian: Gruppo 744) is a class of 2-8-0 steam locomotives; they were the last orthodox steam locomotives built for the FS.[1] [2]
The Class 744 derived from the earlier Class 745 locomotives, with which they shared the boiler and the wheelbase; they were only partially successful, as their inside cylinders (chosen to keep the axle load as low as possible) forced the use of inadequately dimensioned big ends, which tended to run hot. The weight limits had been subsequently relaxed, and a 14.6 tons (later elevated to 14.85 for the Caprotti locomotives) axle load was permitted; this allowed the designers to place the two cylinders outside, avoiding the issue altogether.[3] [4]
The first batch of 25 locomotives was outshopped by Breda in 1927, and had Walschaerts valve gear. The subsequent 25 locomotives were built by Ansaldo (15) and Officine Meccaniche (10) in 1928, and were all fitted with Caprotti valve gear; these were originally classified Class 743, but in 1930 they were reclassified Class 744.1XX.[5] [6]
Designed for mixed traffic working, the Class 744 was mainly allocated to southern Italy, with eighteen of them stationed at Salerno for service on the Salerno–Reggio di Calabria railway, and a further twenty at Palermo and Catania. After the Tyrrhenian line was electrified, some locomotives were transferred to northern Italy, while others were assigned to Sardinia. In 1956 the 744.024 was experimentally fitted with a Giesl ejector. The Class 744 was completely withdrawn from service in the 1970s.[7]
Two Class 744 locomotives have survived into preservation: