The research In-Between Walls, Rests and Holes seeks to discuss the actualization in the wall dispositif of the Santa Cruz railway branch in Rio de Janeiro through the realization of urban wanderings. The work starts from certain invisibility of this urban dispositif, understanding it as a result of its historical process of stratification. The practice of wanderings emerges as a possible way of actualizing this dispositif, inasmuch as it constitutes a body experience of alterity and therefore acts in a specific aesthetical condition, an In-Between condition. Untangling this dispositif through three lines of relationships established in this research – Walls, Rests and Holes –, this work discusses which modes of operation can conceptually and empirically drag them from their stratifications to their actualizations. Thus, narratives of the experiences will be developed as affective writings of wanderings carried out along three parts of the Santa Cruz railway branch: Engenho de Dentro, Engenho Novo and Encantado. These narratives, expose Walls, Rests and Holes unfolding reflections to the aesthetical and critical potenciality of the wanderings to the discussion about urban dispositifs and In-Between conditions in the contemporary city.