A gas turbine engine , comprising: a turbine section (28; 60) positioned about an engine central longitudinal axis (A); at least one vane section (561B; 561C) within the turbine section (28; 60) including a platform (563B; 563C) providing a lip (570B; 570C) and having a rail (572B; 572C) extending radially from the platform (563B; 563C) with respect to the engine central longitudinal axis (A) and at an axial location spaced from an outer axial extension of the lip (570B; 570C), wherein an inner face of the rail (572B; 572C) and a surface of the platform (563B; 563C) at least partially provide a cavity (578B; 578C), and a first opening (580B; 580C) extending from the inner face to an outer face (582B; 582C) of the rail (572B; 572C) opposite the inner face to provide fluid communication from the cavity (578B; 578C) to the lip (570B; 570C); and a support (588B; 588C) comprising a body portion radially inward of the platform (563B; 563C) and an extension (585B; 585C) characterised in that the extension (585B; 585C) extends radially outward from the body portion and provides a mating face (504B; 504C) to interface with the outer face (582B; 582C) of the rail (570B; 570C), wherein the extension (585B; 585C) provides a second opening (502B; 502C) radially and circumferentially aligned with the first opening (580B; 580C), and the first opening (580B; 580C) has a first cross sectional area (505B; 505C) at the outer face (582B; 582C), the second opening (502B; 502C) has a second cross sectional area (503B; 503C) at the mating face (504B; 504C), and the first cross sectional area (505B; 505C) is different from the second cross sectional area (503B; 503C). a turbine section (28; 60) positioned about an engine central longitudinal axis (A); at least one vane section (561B; 561C) within the turbine section (28; 60) including a platform (563B; 563C) providing a lip (570B; 570C) and having a rail (572B; 572C) extending radially from the platform (563B; 563C) with respect to the engine central longitudinal axis (A) and at an axial location spaced from an outer axial extension of the lip (570B; 570C), wherein an inner face of the rail (572B; 572C) and a surface of the platform (563B; 563C) at least partially provide a cavity (578B; 578C), and a first opening (580B; 580C) extending from the inner face to an outer face (582B; 582C) of the rail (572B; 572C) opposite the inner face to provide fluid communication from the cavity (578B; 578C) to the lip (570B; 570C); and a support (588B; 588C) comprising a body portion radially inward of the platform (563B; 563C) and an extension (585B; 585C) characterised in that the extension (585B; 585C) extends radially outward from the body portion and provides a mating face (504B; 504C) to interface with the outer face (582B; 582C) of the rail (570B; 570C), wherein the extension (585B; 585C) provides a second opening (502B; 502C) radially and circumferentially aligned with the first opening (580B; 580C), and the first opening (580B; 580C) has a first cross sectional area (505B; 505C) at the outer face (582B; 582C), the second opening (502B; 502C) has a second cross sectional area (503B; 503C) at the mating face (504B; 504C), and the first cross sectional area (505B; 505C) is different from the second cross sectional area (503B; 503C). <EOS>