At the Brussels International exhibition of 1910 the Belgian engineer exhibited his new Type 10 Pacific, the most powerful European locomotive of the time. This was a four-cylinder superheated passenger locomotive with a distinctive tapered boiler of Flamme's design. Flamme used the large Belgian loading gauge to its most and made the round-topped boiler particularly high. The tapered section ahead of the firebox reduced to a boiler barrel which allowed enough height above for the steam dome.