Assembly members from all parties have called for the electrification of the Great Western rail line to Swansea.
AMs were taking part in a Conservative led debate on improving transport connectivity in Wales, on 20 June 2012.
Opening the debate for the Welsh Conservatives, Byron Davies AM said the assembly was "pushing at an open door" for electrification.
He said: "It is incumbent on all in this chamber and the greater business community to continue pushing on that door.
"We have clear competition for this investment and we need to work together and share every weapon in the arsenal to lobby effectively."
The UK government announced plans to electrify the Great Western line as far as Cardiff last year.
But the Welsh government wants the project to go further west to Swansea and into the valleys.
Welsh Secretary Cheryl Gillan told AM's last month that the UK government must see a business case before it can electrify the main Paddington-Swansea railway line.
Liberal Democrat AM William Powell said he was pleased to see Labour supported plans for electrification, following "years of inaction".
The Welsh Liberal Democrats had tabled amendments stating that the previous UK Labour government did not electrify the main line, and they also called for the introduction of a Wales-wide Oystercard.
Mr Powell told AMs that the introduction of an Oystercard would make journeys "easier and more accessible" and said passengers would no longer be left "stranded" because they did not have any cash on them.
Plaid Cymru's Iuean Wyn Jones used his contribution to call for even greater integration of the transport network in Wales.
Mr Wyn Jones told AMs: "For the very first time in the history of post-devolution Wales the government now does spend more money on public transport than it does on road building."
He added that rail infrastructure spending should be devolved to the Welsh assembly to allow public transport spending to be prioritised in the future.
Responding to the debate, Transport Minister Carl Sargeant said the Welsh government were prioritising transport despite "a reduction in capital spend" from the UK government.
Mr Sargeant pointed to the fact the UK Labour government had already committed to the electrification of the rail line from London to Swansea in 2009.
Mr Sargeant added that the Welsh government had a "strong case" for continuing electrification to Swansea and the valley lines, and would continue to press the case with MPs and UK ministers.
Read this in Welsh.