Racing Partnership outfit, where he failed to score. Moss returned in the German Grand Prix, where he retired, but returned to winning form in Portugal, Italy and International Gold Cup. Trintignant's best score was second place at the US Grand Prix. Walker decided to concentrate solely on Moss and switched to a Lotus in 1960, starting from Monaco, which Moss won, the first time a Lotus won a Formula 1 race. Moss would triumph only at the non-championship International Gold Cup in Oulton Park and the US GP at Riverside, but still managed to finish the season in third place overall, as had happened the previous year. After the end of the season, in December, Walker took Moss to two South African races, which he won. In 1961, F1 adopted the new 1.5 L engine regulations, and Walker flirted with the idea of building his own chassis, but retained the Lotus 18 for the season. Moss won the non-championship races at Goodwood in the 2.5 L Intercontinental Formula and Vienna, as well as the Monaco and German Grands Prix. At the 1961 British Grand Prix, Rob Walker Racing became the first team ever to enter a four-wheel drive car for a World Championship Grand Prix, when they entered the Ferguson P99 on behalf of Ferguson Research. Moss later won that season's Oulton Park International Gold Cup race in the same car; to date, this is the only win ever recorded by a four-wheel drive car in a Formula One event. The post-Moss era The 1962 season started well enough, with the returning Trintignant winning at Pau, but Walker's plans were shaken when Moss had an accident at the Goodwood Glover Trophy meeting driving a BRP-entered Lotus, finishing his career. Walker had planned to enter a Ferrari for the British driver in the World Championship, but was forced to retain Trintignant, the elder French driver becoming increasingly uncompetitive, not scoring a single championship point. The year's misfortunes continued in Mexico and South Africa, where Walker saw drivers Ricardo Rodriguez and Gary Hocking die at the wheel of his cars. Rob Walker changed strategy for 1963, employing Jo Bonnier and returning to the Cooper chassis (the Swede had raced for Walker at Oulton Park the previous year), but once more results were sparse and mechanical failures frequent. Still, the team beefed up its operations for 1964, first with a new Cooper (with