As a part of the project METRO (Work Package 5), scale model tests of explosions inside a modelled train carriage located in a tunnel were carried out. The scale model tests aimed to verify the numerical simulations of pressure loadings inside and outside the carriage that were made earlier in the project in the same Work Package [1]. In the scale model tests, the explosion was assumed to take place in the centre of the carriage. It was also assumed that the explosion immediately ripped up a hole in the side walls and ceiling of the carriage with a specific area. The modelled carriage was therefore equipped with a slot near the charge, and in most tests the slot was covered with thin aluminium plates that would simulate the break-up of the side walls and the roof at the time of explosion. The structure of the carriage was otherwise designed rigid, as well as the inside walls of the tunnel. The slot area, the weight of the explosive charge and number of carriages were varied in order to simulate different scenarios. This report describes the design of the test object and the test matrix, and the results from the pressure measurements are presented.