This report describes full-scale experiments conducted in a railway tunnel under real fire conditions. The aim was to study firefighters’ searching and moving speed, air consumption and risk assessment when operating without simultaneous build-up of fire hoses in smoke-filled environments. The experiments were carried out in a decommissioned tunnel, where firefighters advanced 170–200 m towards a mock-up train fire. The results showed an average searching speed of approximately 0.3 m/s and a moving speed of approximately 0.85 m/s. Air consumption was lower compared to operations involving handling of hoses, although significant individual variation was observed. Measurements using thermal imaging cameras consistently underestimated gas temperatures compared to thermocouples, indicating uncertainties in temperature interpretation under smoke-filled conditions. The use of thermal imaging cameras in combination with continuous LED guidance lighting did however contribute to a high level of perceived safety. The findings support continued development of fire and rescue methods without simultaneous hose build-up in smoke-filled tunnel environments, provided that continuous risk assessment is maintained.