Frost protection for an automatic hot drinks machine (HGA) in a rail vehicle, - wherein the automatic hot drinks machine (HGA) has a fresh water container (FWB), a pressure-increasing pump (A5) and a hot water boiler (A8), - wherein the fresh water container (FWB) is filled with fresh water (FW) which is provided and used for hot drinks preparation, - wherein the pressure-increasing pump (A5) is arranged between the fresh water container (FWB) and the hot water boiler (A8) such that fresh water (FW) passes from the fresh water container (FWB) via the pressure-increasing pump (A5) to the hot water boiler (A8), - wherein the pressure-increasing pump is designed in such a way that fresh water (FW) fed to it is brought to a predetermined operating pressure for a desired hot drinks preparation, - wherein the hot water boiler (A8) is configured in such a way that it heats fresh water (FW) fed to it for the planned hot drinks preparation, - wherein a controllable first drainage valve (A91) is arranged between the fresh water container (FWB) and the pressure-increasing pump (A5) and is connected in such a way that, when there is a risk of frost, the line system (LS) between the fresh water container (FWB) and the pressure-increasing pump (A5) is emptied of fresh water (FW), and - wherein a controllable second drainage valve (A92) is arranged between the pressure-increasing pump (A5) and the hot water boiler (A8) and is connected in such a way that, when there is a risk of frost, the line system (LS) between the pressure-increasing pump (A5) and the hot water boiler (A8) and also the contents of the hot water boiler (A8) are emptied of fresh water (FW) . - wherein the automatic hot drinks machine (HGA) has a fresh water container (FWB), a pressure-increasing pump (A5) and a hot water boiler (A8), - wherein the fresh water container (FWB) is filled with fresh water (FW) which is provided and used for hot drinks preparation, - wherein the pressure-increasing pump (A5) is arranged between the fresh water container (FWB) and the hot water boiler (A8) such that fresh water (FW) passes from the fresh water container (FWB) via the pressure-increasing pump (A5) to the hot water boiler (A8), - wherein the pressure-increasing pump is designed in such a way that fresh water (FW) fed to it is brought to a predetermined operating pressure for a desired hot drinks preparation, - wherein the hot water boiler (A8) is configured in such a way that it heats fresh water (FW) fed to it for the planned hot drinks preparation, - wherein a controllable first drainage valve (A91) is arranged between the fresh water container (FWB) and the pressure-increasing pump (A5) and is connected in such a way that, when there is a risk of frost, the line system (LS) between the fresh water container (FWB) and the pressure-increasing pump (A5) is emptied of fresh water (FW), and - wherein a controllable second drainage valve (A92) is arranged between the pressure-increasing pump (A5) and the hot water boiler (A8) and is connected in such a way that, when there is a risk of frost, the line system (LS) between the pressure-increasing pump (A5) and the hot water boiler (A8) and also the contents of the hot water boiler (A8) are emptied of fresh water (FW) . <EOS>