The steam locomotives of Südbahn Class 23 (old) were goods train engines worked by the Austrian Southern Railway (österreichische Südbahn).

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Quick Facts SB 23 (alt), 29BBÖ 49 / JDŽ 124 / MÁV 332 / FS 193 ÖBB 153, Specifications ...

SB 23 (alt), 29 BBÖ 49 / JDŽ 124 / MÁV 332 / FS 193 ÖBB 153
GKB 671, ex BBÖ 49.03, ex SB 671
Specifications Configuration: ​  • Whyte 0-6-0 Gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge Driver dia. 1,245 mm (4 ft 1.0 in) Wheelbase: ​  • Overall 2,950 mm (9 ft 8 in)  • incl. tender 9,894 mm (32 ft 5.5 in) Length: ​  • Over beams 14,254 mm (46 ft 9.2 in) Adhesive weight 38.0 t (37.4 long tons; 41.9 short tons) Service weight 38.0 t (37.4 long tons; 41.9 short tons) Tender type SB 12 Fuel capacity 5.4 t (5.3 long tons; 6.0 short tons) coal Water cap. 8.4 m3 (1,800 imp gal; 2,200 US gal) Boiler: ​ No. of heating tubes 183 Boiler pressure 6.75 bar (675 kPa; 97.9 psi) Heating surface: ​  • Firebox 1.59 m2 (17.1 sq ft)  • Radiative 8.50 m2 (91.5 sq ft)  • Evaporative 113.20 m2 (1,218.5 sq ft) Cylinder size 460 mm (18.11 in) Piston stroke 632 mm (24.88 in)
Performance figures Maximum speed 45 km/h (28 mph)

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The precursors to the Austrian Southern Railway had a very disparate fleet of goods locomotives. The Southern Railway therefore had a six-coupled freight locomotive developed which was based the French Bourbonnais prototype. This series was initially given the designation 23, but was reclassified to 29 in 1864. The Lokomotivfabrik der StEG engine works delivered 20 units in 1860, which proved themselves so well that a total of 205 were built up to 1872 by this factory along with the Wiener Neustädter Lokomotivfabrik and Maschinenfabrik Esslingen.

In the course of time there were naturally several modifications: in 1861 to the driver's cab, in the 1880s a vacuum brake with sound absorbers, new boilers, etc...

After nationalisation in 1924 the Federal Railway of Austria (BBÖ) took over 47 units, that were grouped into BBÖ Class 49. After the Second World War a few engines, classified by the Deutsche Reichsbahn as DRB 53.7111–7116, remained in Austria. Of these, the ÖBB only took over number 153.7114 but withdrew it in 1953.

Amazingly, five of them are preserved.

During the 1920s the BBÖ sold several engines to the Graz-Köflacher Bahn (GKB). Three of them, built in 1860, were preserved alongside two other Class 23 :

• One of them, number GKB 671, is still working today, albeit with some small modifications such as compressed-air brakes thanks to the work of the Steirischen Eisenbahnfreunde (Styrian Railway Society). Built in 1860, the Austrian-made Südbahn Class 23 (old) locomotive on the Graz-Köflach railway (GKB), is the longest serving steam engine in the world. It is frequently on duty and is used to haul steam specials.
• GKB 674 ex Südbahn 674,^[2] has been preserved by the Budapest transport museum and restored with its early roofless drivers cab.
• GKB 680 now belongs to the German Museum of Technology in Berlin.^[3]
• Südbahn 718, used by Yugoslav railways, resides in the Slovenian Railway Museum. Built in 1861, was restored with Südbahn livery and an open-top cab.
• Südbahn 852, used by ÖBB until 1958, is awaiting restoration, tenderless, at heizhaus Strasshof.^[4][5]

• GKB 671 in 2017.
• Südbahn 674 in Budapest.
• GKB 680 in Berlin.
• Südbahn 718 in Ljubljana .
• Südbahn 859, behind a Kaiserin Elisabeth Bahn locomotive.

• List of DRG locomotives and railbuses