AndroidBango
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Saw the signs when passing through to work this morning, but here's the spiel from the TFL website.
tfl.gov.uk
No down escalator to the southbound Northern line (City branch) and the southbound Victoria line platforms.
Access to these platforms will be via the spiral staircase only and this will lead to a slower movement of people within the station. In order to prevent overcrowding inside the Tube station, at busy times a queue to enter the Underground station will be in place at street level by the plaza outside the National Rail station.
To avoid queueing, or if you are travelling with children, buggies, luggage or have difficulty using stairs, you are advised to start your journey at other nearby stations:
Warren Street for the Northern line (Charing Cross branch) and the Victoria line, or
King's Cross St Pancras for the Northern line (City branch) and the Victoria line.
Alternatively, use Euston Square, from where you can travel one-stop to King's Cross St Pancras and change for the Northern line (City branch) or Victoria line.
These bus routes from outside Euston can be used to transfer to alternative entry stations: Routes 18, 30, 205 to Warren Street. Routes 30, 73, 91, 205, 390 to King's Cross St Pancras.
Arriving at Euston on London Overground services
If you normally arrive at Euston on a London Overground train and then transfer to the Underground, you are advised to avoid the queue and the stairs by changing onto the Bakerloo line at Queen's Park. You should then travel to Oxford Circus for the Victoria line, to Embankment for the Northern line (Charing Cross branch), or to Elephant & Castle for the Northern line (City branch).
Stations, lifts, escalators, works and closures
Look ahead at planned works that affect stations, escalators and lifts

No down escalator to the southbound Northern line (City branch) and the southbound Victoria line platforms.
Access to these platforms will be via the spiral staircase only and this will lead to a slower movement of people within the station. In order to prevent overcrowding inside the Tube station, at busy times a queue to enter the Underground station will be in place at street level by the plaza outside the National Rail station.
To avoid queueing, or if you are travelling with children, buggies, luggage or have difficulty using stairs, you are advised to start your journey at other nearby stations:
Warren Street for the Northern line (Charing Cross branch) and the Victoria line, or
King's Cross St Pancras for the Northern line (City branch) and the Victoria line.
Alternatively, use Euston Square, from where you can travel one-stop to King's Cross St Pancras and change for the Northern line (City branch) or Victoria line.
These bus routes from outside Euston can be used to transfer to alternative entry stations: Routes 18, 30, 205 to Warren Street. Routes 30, 73, 91, 205, 390 to King's Cross St Pancras.
Arriving at Euston on London Overground services
If you normally arrive at Euston on a London Overground train and then transfer to the Underground, you are advised to avoid the queue and the stairs by changing onto the Bakerloo line at Queen's Park. You should then travel to Oxford Circus for the Victoria line, to Embankment for the Northern line (Charing Cross branch), or to Elephant & Castle for the Northern line (City branch).