For comparison, on London Underground the escalators are refurbished every 20 years, and replaced every 40 years. https://tfl.gov.uk/campaign/tube-improvements

For comparison, on London Underground the escalators are refurbished every 20 years, and replaced every 40 years. https://tfl.gov.uk/campaign/tube-improvements/behind-the-scenes/escalator-refurbishment https://tfl.gov.uk/campaign/tube-improvements/behind-the-sce...