  We study the Robinson-Trautman-Maxwell Fields in two closely related
coordinate systems, the original Robinson-Trautman (RT) coordinates (in a more
general context, often referred to as NU coordinates) and Bondi coordinates. In
particular, we identify one of the RT variables as a velocity and then from the
Bondi energy-momentum 4-vector, we find kinematic expressions for the mass and
momentum in terms of this velocity. From these kinematic expressions and the
energy-momentum loss equation we obtain surprising equations of motion for `the
center of mass' of the source where the motion takes place in the
four-dimensional Poincare translation sub-group of the BMS group.
