In the case of 16303/04 ERS TVC ERS Vanchinad Express, running time has only increased with doubling of railway line!
During its initial years, Vanchinad covered 221 km from ERS to TVC in 4 hours or so(with DLS traction on a single line track, with just 2 stoppages @ KTYM & QLN). But now, it takes 4 hours 55 minutes to cover the same distance, with the train running almost 75% of the distance in double line, with Electric traction. Incidentally, the stoppages have increased to 17!!