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Steam Locomotives of the FS[Inhalt]
Italian State Railway class 690 II
Italy | 1911 | 33 produced
Die Lokomotive, June 1911

Around 1910, the FS also realized that, thanks to superheater technology, compound engines could be dispensed with. Therefore the Pacifics of the class 690 II with four cylinders were commissioned. For the first time on a simple expansion locomotive in Italy, two adjacent cylinders used a common piston valve. The locomotives were designed for an axle load of 18 tonnes, but were ultimately manufactured with an axle load of only 17.1 tonnes for a better road availability.

The first nine were built with the driver's position on the right, the remaining 24 had it on the left. The firebox was partly located between the drivers and was therefore trapezoidal and narrow at the front. Since the grate had too small an area, the output was only 1,400 hp. Together with the axle load, which was still too high for most lines, no further class 690 locomotives were built. This led to a rebuild to class 691 at the end of the twenties and the class 695 to be developed as a successor.

General
Built1911-1914
ManufacturerBreda, Officine Meccaniche, Ansaldo
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length73 ft 0 15/16 in
Length loco42 ft 10 3/16 in
Wheelbase32 ft 11 11/16 in
Fixed wheelbase14 ft 1 5/16 in
Empty weight173,724 lbs
Service weight192,463 lbs
Adhesive weight112,436 lbs
Total weight301,812 lbs
Axle load37,699 lbs
Water capacity5,283 us gal
Fuel capacity17,637 lbs (coal)
Power
Power sourcesteam
Indicated power1,381 hp (1,030 kW)
Optimal speed28 mph
Top speed81 mph
Starting effort31,103 lbf
Power Plant
Driver diameter79.9 in
Boiler pressure174 psi
Expansion typesimple
Cylindersfour, 17 11/16 x 26 3/4 in
Boiler
Grate area37.7 sq ft
Firebox area172.2 sq ft
Tube heating area2,088.2 sq ft
Evaporative heating area2,260.4 sq ft
Superheater area721.2 sq ft
Total heating area2,981.6 sq ft
Calculated Values
steam locomotive
express
last changed: 02/2024
Italian State Railway class 691
Italy | 1928 | 33 produced
691.022 in the “Leonardo da Vinci” museum in Milan
691.022 in the “Leonardo da Vinci” museum in Milan
Jakub Halun
General
Built1928-1934
ManufacturerFS, Breda
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length74 ft 3 1/8 in
Length loco45 ft 2 15/16 in
Wheelbase35 ft 11 1/8 in
Fixed wheelbase14 ft 1 5/16 in
Total wheelbase65 ft 1 1/8 in
Empty weight178,574 lbs
Service weight199,518 lbs
Adhesive weight119,049 lbs
Total weight330,693 lbs
Axle load39,683 lbs
Water capacity7,661 us gal
Fuel capacity10,362 lbs (coal)
Power
Power sourcesteam
Indicated power1,730 hp (1,290 kW)
Optimal speed27 mph
Top speed81 mph
Starting effort41,488 lbf
Power Plant
Driver diameter79.9 in
Boiler pressure232 psi
Expansion typesimple
Cylindersfour, 17 11/16 x 26 3/4 in
Boiler
Grate area46.3 sq ft
Firebox area183 sq ft
Tube heating area2,368.1 sq ft
Evaporative heating area2,551 sq ft
Superheater area721.2 sq ft
Total heating area3,272.2 sq ft
Calculated Values
steam locomotive
express
last changed: 10 2023
Italian State Railway class 740
Italy | 1911 | 470 produced
In August 1973 in Nova Gorica, Slovenia
In August 1973 in Nova Gorica, Slovenia
8474tim

The Grupo 740 of the Italian State Railway was a freight locomotive with a 2-8-0 wheel arrangement, which achieved the highest number of all steam locomotives on this railway. It was based on the Grupo 730, but unlike it had no compound engine and was superheated. From 1911 the locomotives were supplied by Breda and Ansaldo and after the First World War Henschel supplied a larger number as reparation, which had three-axle tenders instead of four. A total 470 were made by 1923.

Like the 730, they could be used freely due to their low axle load and could also pull passenger trains if necessary. Officially they were approved for a speed of 65 km/h, but could also reach up to 80 km/h. Seven were rebuilt to Caprotti valve gear, which was successful, but due to more difficult maintenance led to these locomotives being retired in the 1960s.

The rebuilds to Franco Crosti boilers, which was carried out on 175 locomotives, was more successful. These were divided into Grupo 743, which had a preheater on both sides of the boiler, and Grupo 741 with only one preheater under the boiler, which delivered the same power. Both the rebuilt and non-rebuilt ones survived until the end of the steam age on the FS in the seventies. Some were even kept as reserves until the early nineties. A total of 49 were preserved, three of which are still operational.

Variantthree-axle tenderfour-axle tender
General
Built1911-1923
ManufacturerBreda, Ansaldo, Henschel
Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length59 ft 3 5/8 in65 ft 2 7/8 in
Wheelbase23 ft 11 3/8 in
Fixed wheelbase9 ft 10 1/8 in
Total wheelbase55 ft 6 15/16 in
Empty weight131,836 lbs
Service weight146,607 lbs
Adhesive weight124,341 lbs
Total weight216,935 lbs255,956 lbs
Axle load31,085 lbs
Water capacity3,170 us gal5,812 us gal
Fuel capacity13,228 lbs (coal)
Power
Power sourcesteam
Indicated power966 hp (720 kW)
Optimal speed18 mph
Top speed40 mph
Starting effort34,156 lbf
Power Plant
Driver diameter53.9 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 21 1/4 x 27 9/16 in
Boiler
Grate area30.8 sq ft
Firebox area115.2 sq ft
Tube heating area1,527.4 sq ft
Evaporative heating area1,642.6 sq ft
Superheater area573.7 sq ft466.1 sq ft
Total heating area2,216.3 sq ft2,108.6 sq ft
Calculated Values
steam locomotive
freight
last changed: 01/2024
Italian State Railway class 741
Italy | 1953 | 81 produced
741 273 in September 1973 in Brunico
741 273 in September 1973 in Brunico
Michel Huhardeaux
Variantthree-axle tenderfour-axle tender
General
Built1953-1960
ManufacturerOfficina Grandi Riparazioni Verona
Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length59 ft 3 5/8 in65 ft 2 7/8 in
Wheelbase23 ft 11 3/8 in
Fixed wheelbase8 ft 6 3/8 in
Empty weight131,836 lbs
Service weight150,576 lbs
Adhesive weight123,459 lbs
Total weight220,903 lbs259,704 lbs
Axle load32,628 lbs
Water capacity5,812 us gal
Fuel capacitycoal13,228 lbs (coal)
Power
Power sourcesteam
Indicated power1,086 hp (810 kW)
Optimal speed20 mph
Top speed40 mph
Starting effort34,156 lbf
Power Plant
Driver diameter53.9 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 21 1/4 x 27 9/16 in
Boiler
Grate area30.1 sq ft
Evaporative heating area1,212 sq ft
Superheater area473.6 sq ft
Total heating area1,685.6 sq ft
Calculated Values
steam locomotive
freight
Franco-Crosti boiler
last changed: 10 2023
Italian State Railway classes 746 and 747
Italy | 1923 | 60 produced
Die Lokomotive, August 1933

When in the early 1920s, the existing six-coupled express locomotives of the FS could no longer provide sufficient adhesive weight on hilly routes, the FS was one of the first railway companies in Europe to develop an eight-coupled express locomotive. This was the only way to comply with the maximum axle load of 17 tonnes that applied on hilly routes such as those in the Rome and Florence area. It was based on the 2-6-2 locomotive of the class 680 and added another coupled axle

While up to this point engines based on the Plancher system were preferred for four-cylinder compound locomotives in Italy, here the system according to von Borries, which was also used in Germany, was used. There were thus two inside high-pressure cylinders and two outside low-pressure cylinders, all of which acted on the third coupled axle. In order to create space for the connecting rods of the inner cylinders, the cylinders were arranged somewhat higher and inclined, and the second coupling axle was slightly cranked.

In contrast to the bar frame, which was very popular with express locomotives on the European mainland at the time, a plate frame with a thickness of 30 mm was used here. The leading axle with a lateral play of 94 mm was combined with the first coupled axle to form a Zara bogie and gave it a play of 20 mm. Due to the large grate area, the trailing axle was further away from the last coupled axle and therefore had a lateral play of 140 mm.

Schematic drawing with dimensions
Schematic drawing with dimensions
Locomotive Magazine, July 1921

The production initially consisted of 40 engines that were supplied by Breda and had Heusinger valve gear. Another 20 pieces came from Ansaldo and received a Caprotti valve gear. These were initially designated class 477 and redesignated 746.100 in 1929. After their original routes were electrified, the locomotives were re-stationed once each in 1935 and 1937. They eventually landed in Sicily and were retired by 1967. Today only the 746.038 survives and is located in Milan, where it was once made.

General
Built1923, 1926-1927
ManufacturerBreda, Ansaldo
Axle config2-8-2 (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length74 ft 9 1/16 in
Length loco42 ft 9 3/8 in
Wheelbase36 ft 10 1/2 in
Fixed wheelbase25 ft 11 13/16 in
Total wheelbase66 ft 1 11/16 in
Empty weight187,393 lbs
Service weight205,030 lbs
Adhesive weight145,505 lbs
Total weight314,379 lbs
Axle load36,376 lbs
Water capacity5,812 us gal
Fuel capacity13,228 lbs (coal)
Power
Power sourcesteam
Estimated power1,810 hp (1,350 kW)
Optimal speed36 mph
Top speed68 mph
Starting effort31,764 lbf
with start valve38,117 lbf
Power Plant
Driver diameter74 in
Boiler pressure203 psi
Expansion typecompound
Cylindersfour, HP: 19 5/16 x 26 3/4 in
and LP: 28 3/8 x 26 3/4 in
Boiler
Grate area46.3 sq ft
Firebox area183 sq ft
Tube heating area2,368.1 sq ft
Evaporative heating area2,551 sq ft
Superheater area721.2 sq ft
Total heating area3,272.2 sq ft
Calculated Values
steam locomotive
express
Von Borries compound
last changed: 09/2022
Italian State Railway class 835
Italy | 1906 | 70 produced
835 040 exhibited in Pula, Croatia
835 040 exhibited in Pula, Croatia
Orlovic
General
Built1906-1922
ManufacturerAnsaldo, Breda, Reggiane, Officine Meccaniche
Axle config0-6-0ST (Six-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length30 ft 0 5/8 in
Wheelbase11 ft 9 3/4 in
Fixed wheelbase11 ft 9 3/4 in
Empty weight88,185 lbs
Service weight99,869 lbs
Adhesive weight99,869 lbs
Axle load33,290 lbs
Water capacity1,321 us gal
Fuel capacity3,307 lbs (coal)
Power
Power sourcesteam
Indicated power365 hp (272 kW)
Optimal speed13 mph
Top speed34 mph
Starting effort17,904 lbf
Power Plant
Driver diameter51.6 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 16 9/16 x 22 13/16 in
Boiler
Grate area15.9 sq ft
Firebox area74.9 sq ft
Tube heating area767.4 sq ft
Evaporative heating area842.3 sq ft
Total heating area842.3 sq ft
Calculated Values
steam locomotive
freight
tank locomotive
last changed: 08 2023
Italian State Railway class 980
Italy | 1908 | 12 produced
980.02 in the SLM data sheet
980.02 in the SLM data sheet
SBB Historic
General
Built1908-1913
ManufacturerSLM
Axle config0-6-0RT (Six-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length29 ft 9 1/16 in
Wheelbase12 ft 5 5/8 in
Fixed wheelbase12 ft 5 5/8 in
Empty weight80,248 lbs
Service weight97,885 lbs
Adhesive weight97,885 lbs
Axle load32,628 lbs
Water capacity872 us gal
Fuel capacity2,205 lbs (coal)
Power
Power sourcesteam
Indicated power436 hp (325 kW)
Optimal speed12 mph
Top speed25 mph
Power Plant
Driver diameter40.9 in
Boiler pressure203 psi
Expansion typecompound
Cylindersfour, 16 15/16 x 19 11/16 in
Boiler
Grate area19.4 sq ft
Evaporative heating area951.5 sq ft
Total heating area951.5 sq ft
Calculated Values
steam locomotive
passenger
freight
cog railway
tank locomotive
last changed: 10 2023
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