It will be a costly mistake if the Kuala Lumpur-Singapore high-speed rail (HSR) is aborted, said the chief executive officer of MyHSR Corp Mohd Nur Ismal Mohamed Kamal on Thursday. Opposition leader Mahathir Mohamad is opposed to HSR. Citing financial constraints, the former prime minister, who is chairman of Parti Pribumi Bersatu Malaysia, said the HSR contract signed between Malaysia and Singapore may not be a done deal if the Opposition comes to power. The HSR project that cuts across four states in Malaysia aims to stimulate development along the corridor and create economic clusters around the seven stations from Bandar Malaysia, Putrajaya, Seremban, Melaka to Muar, Batu Pahat and Iskandar Puteri before leaving the international border to Singapore.