A railway rail induction-welding device comprising: a device support; a railway rail alignment means for aligning opposing railway rails in three mutually perpendicular directions, the railway rail alignment means including a first and a second clamping and lifting module (14a, 14b) supported by the device support; the first clamping and lifting module comprising a first railway-rail clamping element and a co-located first vertical lifting element, and the second clamping and lifting module comprising a second railway-rail clamping element and a co-located second vertical lifting element, at least one of the first and second vertical lifting elements being movably supported by the device support, a plurality of clamping heads being provided for each of the first and second clamping elements; the first and second railway-rail clamping elements configured to horizontally and longitudinally align the opposing railway rails when gripped by the first and second railway-rail clamping elements, at least one of the first and second railway clamping elements being movably supported by the device support; and the first and second vertical lifting elements for vertically aligning the opposing railway rails; urging means for moving the first clamping and lifting module towards the second clamping and lifting module to bring aligned opposing railway rails towards each other; and an induction heating device on the device support and interposed or interposable between the first and the second railway-rail clamping modules (14a, 14b) to inductively weld the opposing railway rails together; characterised in that a plurality of lifting heads is provided for each of the first and second vertical lifting elements, the lifting heads being engageable with the said opposing railway rails, and the clamping heads and the lifting heads of each of the clamping and lifting modules (14a, 14b) being provided in an alternating configuration. a device support; a railway rail alignment means for aligning opposing railway rails in three mutually perpendicular directions, the railway rail alignment means including a first and a second clamping and lifting module (14a, 14b) supported by the device support; the first clamping and lifting module comprising a first railway-rail clamping element and a co-located first vertical lifting element, and the second clamping and lifting module comprising a second railway-rail clamping element and a co-located second vertical lifting element, at least one of the first and second vertical lifting elements being movably supported by the device support, a plurality of clamping heads being provided for each of the first and second clamping elements; the first and second railway-rail clamping elements configured to horizontally and longitudinally align the opposing railway rails when gripped by the first and second railway-rail clamping elements, at least one of the first and second railway clamping elements being movably supported by the device support; and the first and second vertical lifting elements for vertically aligning the opposing railway rails; the first clamping and lifting module comprising a first railway-rail clamping element and a co-located first vertical lifting element, and the second clamping and lifting module comprising a second railway-rail clamping element and a co-located second vertical lifting element, at least one of the first and second vertical lifting elements being movably supported by the device support, a plurality of clamping heads being provided for each of the first and second clamping elements; the first and second railway-rail clamping elements configured to horizontally and longitudinally align the opposing railway rails when gripped by the first and second railway-rail clamping elements, at least one of the first and second railway clamping elements being movably supported by the device support; and the first and second vertical lifting elements for vertically aligning the opposing railway rails; urging means for moving the first clamping and lifting module towards the second clamping and lifting module to bring aligned opposing railway rails towards each other; and an induction heating device on the device support and interposed or interposable between the first and the second railway-rail clamping modules (14a, 14b) to inductively weld the opposing railway rails together; characterised in that a plurality of lifting heads is provided for each of the first and second vertical lifting elements, the lifting heads being engageable with the said opposing railway rails, and the clamping heads and the lifting heads of each of the clamping and lifting modules (14a, 14b) being provided in an alternating configuration.