  In this paper, we give the flag curvature formula of general
$(\alpha,\beta)$-metrics of Berwald type. We study conformally related
$(\alpha,\beta)$-metrics, especially general $(\alpha,\beta)$-metrics that are
conformally related to invariant $(\alpha,\beta)$-metrics. Also, a necessary
and sufficient condition for a Finsler metric conformally related to an
$(\alpha,\beta)$-metric is given, and conformally related Douglas Randers
metrics are studied. Finally, we present some examples of conformally related
$(\alpha,\beta)$-metrics.
