a curve at high speeds buffer rings 50 will be sufficiently rigid so as to prevent first and second train cabins from contacting one another yet sufficiently elastic so as to allow cabins 12 and 14 to turn with respect to one another about the bend axis buffer rings 50 may be filled with either air or liquid to a pressure sufficient to cushion cabins 12 and 14 buffer rings 50 based on their size and the surface area in contact with cabins 12 and 14 are preferably filled to a low pressure in the range of 5 u2013 25 psi however this is in no way intended to limit the scope of the present invention any pressure capable of providing the necessary level of rigidity elasticity taking into account such variables as temperature train speed and train weight is within the contemplation of the present invention in another embodiment of the present invention as more clearly illustrated in fig2 buffer rings 50 are disposed around outer circumference 18 of tapered end 16 of first train cabin 12 such that rings 50 are disposed in closed volume 32 for the purposes of illustration closed volume 32 formed by first and second outer flanges 30 and 31 will be used throughout buffer rings 50 are disposed within closed volume 32 so as to keep rings 50 within a limited confines so that rings 50 do not slip off of the end of tapered end portion 16 of first cabin 12 so as to maintain a stable cushion between train cabins 12 and 14 in another embodiment of the present invention as illustrated in fig2 buffer rings 50 are disposed within closed volume.