** Shares of Monadelphous Group MND.AX rise as much as 1.1% to a record A$29.930
** Stock on track for a fifth straight session of gains
** Stock has risen 9.5% so far this week, set for best week since the week ended Nov. 14
** On Wednesday, engineering services co was awarded maintenance services contract worth A$300 million ($200.97 million) by Rio Tinto RIO.AX
** Stock up over 10% YTD
($1 = 1.4928 Australian dollars)
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))