Triumph 499cc Side Valve Parallel Twin, Model TRW. This book covers rider's instruction and maintenance of Triumph's TRW Side Valve Twin for 1954.
The TRW 499cc side-valve parallel twin was capable of off-road running in various adverse conditions, including the ability to climb relatively steep grades and to traverse a stream with 15 inches of water. Hence, ruggedness of build, durability and reliability were essential attributes of the TRW
Simplicity of design, ease of maintenance and repair in the field, and such things as a quiet exhaust, so as not to draw the attention of the enemy or to aid them in locating the source of any noise. Part of the original design specifications for what became the TRW was that it was not to be audible at a distance of half a mile.