|buitenland=ja
|land=België
|dienstregeling=20172018
|route=(Alsemberg ←) Braine-l'Alleud - Waterloo
|lijnnr=121
{{RouteTop|
{{RouteRij| {{Rimg|rer}}{{Rimg|0sr}}↑| Alsemberg, Winderickxplein}}
{{RouteRij| {{Rimg|rer}}{{Rimg|rhrr}} | Rhode-Saint-Genèse, Sept Fontaines (''ZevenborrenZevenbronnen'')}}
{{RouteRij| {{Rimg|rer}}{{Rimg|rhrr}} | Braine-l'Alleud, Drève des Pins}}
{{RouteRij| {{Rimg|rer}}{{Rimg|rhrr}} | Braine-l'Alleud, Avenue du Prieuré}}
{{RouteRij| {{Rimg|rer}}{{Rimg|rhrr}} | Chenois-Ermite, Centre}}
{{RouteRij| {{Rimg|rer}}{{Rimg|rhrr}} | Braine-l'Alleud, Château d'Eau}}
{{RouteRij| {{Rimg|rer}}{{Rimg|rhrr}} | Chenois-Ermite, Eglise}}
{{RouteRij| {{Rimg|0sr}}{{Rimg|rhrr}} | Braine-l'Alleud, Mont-Saint-Pont}}
{{RouteRij| {{BRimg|rarr}} | Waterloo, Calvaire}}
{{RouteRij| {{Rimg|rsr}} | Waterloo, Fructidor}}
{{RouteRijStation| {{Rimg|rsTr}} | Waterloo|Waterloo|Waterloo, Place de la Gare}}
{{RouteRij| {{Rimg|rsr}} | Waterloo, Fructidor}}
{{RouteRij| {{Rimg|rsr}} | Waterloo, Quatre Saisons}}
{{RouteRij| {{Rimg|rsr}} | Waterloo, Chemin des Noces}}