Marine rail system including a rail assembly of parallel ramped rails, a winch supporting a steel cable at one end, a carriage including a forward carriage and a rearward carriage with a torque tube of three members, two of the members being telescoping with respect to the third member, connecting said front and rear carriages, and the cable pulling through a front strap the front carriage as well as through a place affixed to the rear carriage through the torque tube. The torque tube provides for flexing of the front carriage and the rear carriage with respect to the watercraft as well as with respect to the rail. The guide bars as well as the length of the torque tube are adjustable to accommodate any width of beam as well as any length of watercraft. Bunk supports slide on an I-beam, providing for adjustability of the bottom of the hull, especially for V-hulled watercraft. The rail sections are in convenient lengths and secured with splicers providing for easy shipment.