CH. Karnchang has signed a THB 6.8 Billion (USD 197 million) Contract with Bangkok Expressway and Metro Public Company Limited as the Concessionaire to Upgrade and Expand the MRT Blue Line.

The scope of work is as follows:

• Procurement of 21 additional rolling stocks, together with the installation of signaling and communication systems on the rolling stocks;
• Improvement to the central signaling system and supporting equipment installed between stations to increase the frequency of rolling stock operations and support the increasing number of rolling stocks;
• Improvement to the central communication system to support communication with the new rolling stocks; and
• Improvement to the remote-control system to enable the train operation control center to appropriately control the ventilation system in the tunnel and cover all possible incidents.

The contract was signed on November 1, 2024. The project operation is scheduled for a period of 1,260 days.