In the early 1930s, the availability of government grants to stimulate the depressed economy enabled the Underground Group to carry out a major modernisation programme, during which many central London stations were brought up to date with escalators to replace the original lifts.
I begyndelsen af 1930'erne gjorde muligheden for offentlige tilskud, der skulle stimulere den svage økonomi, at Underground Group udførte et større moderniseringsprogram, hvor mange stationer i det centrale London blev før up-to-date med rulletrapper, der erstattede de oprindelige elevatorer.