The type 13 consisted of only two four-cylinder 4-6-4T tank locomotives built in 1912 at Tubize. They were intended for heavy suburban and express trains and were tank locomotives since Belgium had many terminal stations where the locomotives could not be turned. Designed by Jean-Baptiste Flamme, here he used his favorite design of a superheated four-cylinder simple. Parts of the running gear were taken over from the type 9 4-6-0, but the diameter of the drivers had been decreased from 1,960 to 1,800 mm. The bogies had a long wheel base of 2,250 mm for steady running at a top speed of 110 km/h. A compensating lever was mounted between the last driving axle and the trailing bogie to reduce the effect of decreasing supplies on the adhesive weight. 

The locomotives were numbered 4701 and 4702 and mainly used between Brussels and Antwerp. There their task was to replace the type 15 4-4-2T tank locomotives. No series production of the type 13 was started due to the outbreak of the war. In the end, their potential tasks were taken over by the type 9 that had been built in greater numbers before the war. After some lines had been electrified, 4701 and 4702 were withdrawn in 1931 and scrapped in 1934.