|Built from 1948 to 1954. Has circuit breaker, whistle control, 110 Watts, a variable output for train control, plus several fixed voltage outputs for control of your accessories. These include 9V, 10V, 15V, and 19V. I do not think there is another Lionel transformer that offers such a variety of voltages as the RW. It makes a great power source for layout accessories! These were originally designed for the Mexican market to reflect the electrical current there.