Our railway system is modernizing by the Chinese contractors. Indian participation in our railway projects is negligible. I don't think India will be angry with Bangladesh if we look for Chinese railway system technology from China. Besides the Indians cannot offer us better railway technology than the Chinese.Agreed on all points.
But diplomatically, angering the Indians may be foolhardy (and expensive).
We should provide concessions for now (where practicable) but for long term reduce dependency on them (their business people).
The Chinese already know where our stance is.