We reported earlier that Lib Dem leader Sir Ed Davey wanted Samir Zitouni to get a medal from the government.
Zitouni was a member of staff on the train on Saturday who helped protect people while an alleged knife attack took place, and is still in hospital.
Richard Holden, the Conservative shadow transport secretary, is now calling for Zitouni to get a gong.
In a letter to the Honours and Appointments Secretariat, Holden wrote: I am writing to request Mr Samir Zitouni, an employee of London North Eastern Railway (LNER) be considered for recognition through the UK Honours system for acts of selfless and outstanding bravery."
He added: "Mr Zitouni sustained life-threatening injuries during the attack and remains in hospital.
"Despite this, the accounts given by passengers, police, and colleagues make clear that his actions were intentional, self-sacrificial, and taken in full awareness of the danger he faced. BTP have publicly described his conduct as 'nothing short of heroic'."
Holden finished the letter: "His conduct clearly exceeds the threshold for recognition for a gallantry award, and I respectfully ask that his case be urgently considered."