Best is DO NOT trade this stock as per 315 Strategy!
One needs to study the historical charts.
I dont have Alsthom charts now but I vaguely remember Alstom in last Sep or october, gave 10 consecutive Buy and Sells in 15 trading days.... so just move on to something that really works with this strategy. Moreover simple crossover also does not work in NIFTY, one has to adhere to all RULES suggested here for exit, reentry, and adds etc.