Tank for storage, transport and distribution of a liquid or liquefied gas, in particular helium, particularly suitable for storage and rail transport, also in the form of ISO container, said tank comprising a first inner vessel for containing said liquid or liquefied gas to be stored, transported, distributed, said first inner vessel being provided with a lateral cylindrical surface a second intermediate vessel placed outside and around said inner vessel, extending along the entire length of the inner vessel and covering it having no points of contact with the lateral cylindrical surface of said inner vessel; said second intermediate vessel being provided with a lateral cylindrical surface both of said inner and intermediate vessels (1,2) being contained in a third outer vessel or casing, said three vessels (1,2,3) are concentric and coaxial one with the other, without close contact between them, said intermediate vessel, made of a material having high thermal conductivity values, also comprises a cylindrical sheet placed externally around the lateral cylindrical surface of said intermediate vessel and suitably spaced from it the shell of said intermediate vessel, so as to create an annular chamber which is closed at the both ends of said lateral surface of said intermediate vessel said closed annular chamber containing, in use, a second cryogenic liquid having a boiling temperature, at atmospheric pressure, greater than the liquid or liquefied gas contained in said inner vessel, preferably liquid nitrogen, so as to shield said inner vessel from the thermal energy entering from the outside, said tank being also provided, in its interior, with an isostatic system of supports (50,60,70) to support said inner and intermediate vessels with respect to the outer casing in such a way as to attach said inner and intermediate vessels (1,2) to said outer casing at their ends, said tank being characterised in that said isostatic system of supports comprising a fixed point support and a support with two degrees of freedom acting as hinged and sliding shoe such as a rocker support, said hinged shoes comprising a system of horizontal supports and a system of vertical supports, wherein the fixed point support and the horizontal support system are placed at the distal and proximal ends of said container, respectively, and they represent the only points of connection between said inner vessel and said intermediate vessel, each of said fixed point support and horizontal support system (50;60) being a horizontal support which is inserted inside a respective cavity formed on said inner vessel and each of said fixed point support and horizontal support system (50;60) comprising a plurality of coaxial concentric tubes of different length, each tube of said plurality of tubes of the fixed point support and horizontal support system (50;60) is appropriately spaced from the other so as to form a respective chamber (11;13) which is closed only at one of its ends while the other end of the chamber (11; 13) is open and in fluid communication with the third outer vessel or casing and/or with the intermediate vessel so as to lengthen the thermal path of a thermal flow coming from the outside, said fixed point support and horizontal support system being (50;60) accommodated in said respective cavity performing also a shielding of the radiation.