one LCT (5) or LCT (6) on the upper deck, in place of transport, and, as an alternative to the LCT (5), two NL pontoon causeway to be carried; the LCT (5) and NL pontoon causeways to be capable of launching directly from the upper deck. To carry 500 tons of military load and to beach with that and sufficient fuel and stores for a return journey at , on draughts forward and aft. To carry a load of sixty tons over the main ramp and ten tons over the vehicle ramp (i.e., the ramp from the upper deck to the bow door. After trials, this was removed from some vessels) To be fitted for operations in the tropics and in cold climates Two major problems made a redesign necessary. The preferred light weight medium-speed (locomotive type) Electro-Motive Diesel 12-567 diesel engines were not immediately available. Staff wanted more power and higher speeds if possible, which the EMD engines could have provided. However, the only engines available were very heavy steam reciprocating engines from frigates that had been cancelled. These delivered two and a half times the power of the diesels. So large were they that significant changes had to be made to accommodate them. Lack of welded construction facilities meant that the hull had to be riveted. This combination of heavy hull and heavy engines meant that speed was only faster than the LCT (2). At the same time, other improvements were made—as well as simplifications required so most of the structure could be assembled with rivets. The cutaway hard chine that had been dropped in the American version of the Mark 2 vessels was restored. The tank deck, which was above the waterline, was made parallel to the keel, there was to be no round down to the upper deck, and the ship was enlarged to accommodate the more bulky machinery. Provision was made for carrying the British Landing Craft Assault (LCA) in gravity davits, instead of American assault craft. Provision was also made for carrying Landing Craft Tank (LCT) and Landing Craft Mechanized (LCM), and NL pontoon causeways. When the design commenced, engineers knew that the beaches where the ships were expected to land would be very flat, but it was not possible to produce a satisfactory vessel with a draught forward, and very little keel slope, so the 1 in 50 keel slope was maintained. It