[thrownaway1984]

There are two problems with this.

(1) Unions. (The tube driver's union is able to stop London and they are not afraid to do so.)

(2) It's not actually very easy to do for several of London's tube stations. Several of the tube stations have curved platforms making it rather harder to install the safety double elevator doors.

[lisivka]

(1) Blame union for every next suicide.

(2) Skip automation on these stations.