Caterpillar Pipelayers Caterpillar 572G Pipelayer Caterpillar 572R Pipelayer Caterpillar 583R Pipelayer Caterpillar 583T Pipelayer Caterpillar 587T Pipelayer Caterpillar 594 Pipelayer Caterpillar 72H Pipelayer Caterpillar PL61 Pipelayer