Casa do Trem Bélico, Colonial military museum in Historical Center, Santos, Brazil.

Casa do Trem Bélico is a colonial building in the historical center of Santos that served as a military arsenal. The structure features thick stone walls with a robust design typical of Portuguese military architecture, containing compact rooms built to withstand the demands of weapon and ammunition storage.

The building was constructed between 1734 and 1738 to store weapons and ammunition for the forts protecting Santos, with a design attributed to engineer José da Silva Pais. Some documents suggest an earlier structure from 1640–1656 may have been renovated. It later housed the Tiro de Guerra nº 11 from 1908 to 1945, and was restored in 2009.

The name refers to its former function as a weapons storage facility, a role deeply connected to the military protection of the settlement. Visitors can observe how the interior spaces were arranged and understand the practical importance this building held for colonial defense.

The building stands on Rua Tiro Onze in the city centre. The ground floor holds a timeline of the conquest and settlement of Santos; the upper floor displays arms and equipment of the Trem Bélico. The 2009 restoration added modern facilities, and the house also serves as headquarters of the Circuito Turístico dos Fortes.

The walls were bound with stone, whale oil and lime, a mix recorded in the sources for this building. The main portal, in a late-Mannerist style, once carried the date 1734 and an imperial coat of arms, torn off by a crowd when the Republic was proclaimed in 1889.