The Type 12 locomotives were primarily used for the fast, relatively lightweight boat trains on the 124 km (77 mi) journey between Brussels and Ostend, with speeds of 120-140 km/h (75-87 mph).

(WHATS THE GAP AT THE CYLINDERS FOR ? EASIER APPROACH & MAINTENANCE ?)

• Type and origin
• Power type Steam
• Designer Raoul Notesse
• Builder Société Anonyme John Cockerill
• Build date 1938–1939
• Total produced 6
• Specifications
• Configuration: ​ • Whyte 4-4-2 • UIC 2′B1′ h2
• Gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge
• Leading dia. 900 mm (35.43 in)
• Driver dia. 2,100 mm (82.68 in)
• Trailing dia. 1,262 mm (49.69 in)
• Loco weight 89 tonnes (87.6 long tons; 98.1 short tons)
• Total weight 116 tonnes
• (114.2 long tons; 127.9 short tons)
• Fuel type Coal
• Fuel capacity 8 tonnes (7.9 long tons; 8.8 short tons)
• Water cap. 24,000 litres (5,300 imp gal; 6,300 US gal)
• Boiler pressure 18 kg/cm2 (1.77 MPa; 256 psi)
• Cylinders Two, inside
• Cylinder size 480 mm × 720 mm (18.90 in × 28.35 in)