New Delhi (PTI): Impressed by the turnaround of Indian Railways, Britain on Friday evinced interest on expansion of Asia's largest rail network and offered expertise for its signalling system and track electrification.

It said it wanted to join hands in various ongoing projects given the similarities of challengies and "capacity constraints" faced by both rail networks.

"Today, following the financial turnaround of India's railways in recent years and the exceptional opportunities for growth, I hope that we can build on that collaboration so that the UK can continue to contribute to the development of one of your most vital national assets; the rail network," British Railways Minister Tom Harris told a seminar organised by the Indian Railways here.

He said he was "very impressed by the turnaround from massive deficiency to massive profit" and at the same time not increasing fares.

Offering British expertise in signalling system and track electrification, he said there were opportunities for Britain to make contribution in expansion and upgradation of the network.

"We can join hands in the ongoing projects here," Harris said.

Britain is currently extending expertise to the Delhi Metro Rail Corporation in rolling stocks and designing stations.

Drawing a parallel with British Railways, he said "a lot of challenges are similar to both of us and we both are facing capacity constraints".