Manning has several meanings:

tr.v. manned, man·ning, mans
To supply with men, as for defense or service: man a ship.
To take stations at, as to defend or operate: manned the guns.
To fortify or brace: manned himself for the battle ahead.

And you phrase i.e. Manning of Level Crossing may be translated as

SampAr par karamchArii tainAt karna = समपार पर कर्मचारी तैनात करना OR समपार पर कर्मचारियों की तैनाती


--------------------------------------------------
Note added at 15 mins (2005-11-12 03:49:47 GMT)
--------------------------------------------------

Typo : Pls read "your phrase" instead of "you phrase"