P438 CEEFAX 2 438 Sat 13 Dec 22:34/28       MORE COMMUTER MISERY AHEAD Staff at two of the newly privatisjd rail companies have voted to strike over some of the Christmas and New Year period. A ballot by employees of South West $rains and South Wales & West trains was said to bj overwhelmingly in favour of industrial action. Staff are in dispute with management over pay and conditions. The RMT union has called three one day strikes on December 19th, January 5th and January 12th. Travel heads 430 Flights 440-457