A seat attachment system for a mass transit vehicle comprising: a rail adapted to be secured to a chassis of the mass transit vehicle, the rail having a longitudinal T-slot, the T-slot defining a first and a second shoulders (32a, 32b) each located on one opposite side of a narrow portion of the T-slot, a first set of longitudinally extending corrugations; a fastener, the fastener being adapted to be received within the T-slot; a seat interface adapted to be mounted to a passenger seat, the seat interface having a third set of corrugations extending longitudinally along a first portion of the seat interface, the third set of corrugations being adapted to cooperate with the first set of corrugations, characterized in that: the rail is provided with the first set of corrugation which extends longitudinally on an external face of the first shoulder and with a second set of corrugations on an external face of the second shoulder, the corrugations of the second set of corrugations being non-parallel to the corrugations of the first set of corrugations the seat interface has a fourth set of corrugations extending on a second portion of the seat interface, the fourth set of corrugations being adapted to cooperate with the second set of corrugations, the second set of corrugations is at a predetermined angle from the first set of corrugations and the fourth set of corrugations is at the same predetermined angle from the third set of corrugations, the third set of corrugations being operative to vertically locate the seat interface by interlocking with the first set of corrugations upon a compression force being developed by the fastener being tightened, the fourth set of corrugations being operative to locate horizontally the seat interface by interlocking with the second set of corrugations upon the compression force being developed by the fastener being tightened. a rail adapted to be secured to a chassis of the mass transit vehicle, the rail having a longitudinal T-slot, the T-slot defining a first and a second shoulders (32a, 32b) each located on one opposite side of a narrow portion of the T-slot, a first set of longitudinally extending corrugations; a fastener, the fastener being adapted to be received within the T-slot; a seat interface adapted to be mounted to a passenger seat, the seat interface having a third set of corrugations extending longitudinally along a first portion of the seat interface, the third set of corrugations being adapted to cooperate with the first set of corrugations, characterized in that: the rail is provided with the first set of corrugation which extends longitudinally on an external face of the first shoulder and with a second set of corrugations on an external face of the second shoulder, the corrugations of the second set of corrugations being non-parallel to the corrugations of the first set of corrugations the seat interface has a fourth set of corrugations extending on a second portion of the seat interface, the fourth set of corrugations being adapted to cooperate with the second set of corrugations, the second set of corrugations is at a predetermined angle from the first set of corrugations and the fourth set of corrugations is at the same predetermined angle from the third set of corrugations, the third set of corrugations being operative to vertically locate the seat interface by interlocking with the first set of corrugations upon a compression force being developed by the fastener being tightened, the fourth set of corrugations being operative to locate horizontally the seat interface by interlocking with the second set of corrugations upon the compression force being developed by the fastener being tightened. the rail is provided with the first set of corrugation which extends longitudinally on an external face of the first shoulder and with a second set of corrugations on an external face of the second shoulder, the corrugations of the second set of corrugations being non-parallel to the corrugations of the first set of corrugations the seat interface has a fourth set of corrugations extending on a second portion of the seat interface, the fourth set of corrugations being adapted to cooperate with the second set of corrugations, the second set of corrugations is at a predetermined angle from the first set of corrugations and the fourth set of corrugations is at the same predetermined angle from the third set of corrugations, the third set of corrugations being operative to vertically locate the seat interface by interlocking with the first set of corrugations upon a compression force being developed by the fastener being tightened, the fourth set of corrugations being operative to locate horizontally the seat interface by interlocking with the second set of corrugations upon the compression force being developed by the fastener being tightened.