Transport for London (TfL) this week called for firms to help develop a concept design to air condition the Bakerloo, Piccadilly and Central deep Tube lines.
It wants to award a single contract to “each suitable service provider” for an initial period of 150 days with a possible 210 day extension.
TfL had previously scaled back its Cooling the Tube programme amid budget constraints following the collapse of Tube upgrade contractor Metronet (NCE 6 December 2007).
It said in the contract notice that there are “risks and integration challenges related to providing air conditioning on deep tube rolling stock”.
As a result, London Underground is keen to assess the suitability of such a system and “confidently specify that a conventional air conditioning system is technically suitable” and should be included as part of train manufacturers’ design for the new trains.
The notice added that multiple air conditioning suppliers may be engaged to undertake the initial study and prepare alternative concept designs.
The concept design study is proposed as two stages - the first, expected to take place between June next year and January 2013, is to design the conventional air conditioning system.
The second is likely to be between January 2013 and November 2013, but its progression would be dependent on the success of the first stage.