To make the modified isolation ward, the middle berth was removed, the lower portion of the compartment plugged by plywood and a provision of partition provided from the aisle side for the isolation of the compartment, the railways said.
These coaches, officials said, will be "economical" and in between the current AC three-tier and non-AC sleeper class.
The first semi-high speed service of the Railways is being considered a boon for tourists visiting the city of Taj Mahal.
Plans are afoot to manufacture 120 coaches with increased axle load of bogies to carry higher load, a senior Railway Ministry official said.
As far as rolling stock programme is concerned, the announcement will be made for manufacturing of 4200 new coaches including 600 LHB coaches in the Rail Budget.
Improvement in passenger amenities and better interiors would also figure in the budgetary proposals.