** Shares of state-run Rail Vikas Nigam rise 3.8% to 75.40 rupees
** The rail infra developer gets 417.8 mln rupees ($5.11 mln) order from Southern Railway for "automatic block signalling" project
** Shares trading above their 50-day and 100-day moving averages indicating bullish sentiment
** Stock rose ~7% in January, continuing gaining trend for the fourth consecutive year
** Railway stocks rose Weds after Union budget set 2.4 trillion rupees capital outlay for sector
($1 = 81.8060 Indian rupees) (Reporting by Hritam Mukherjee in Bengaluru)