Londoners are split over TfL's announcement that the Piccadilly Line is set for major upgrades - with some suggesting that other Underground lines should have come first.

The project will cost an estimated £2.9 billion, with the Tube line expected to close later in the year for improvements to the infrastructure and the testing of new trains.

While some Londoners hailed the news as "fantastic", others in the capital believed TfL (Transport for London) should have prioritised the other Underground lines.

READ MORE: London Tube Piccadilly line to close as TfL make upgrades

One Londoner Mark Boulton said on Facebook: "Still don't understand why the Piccadilly line needs new trains more than the Bakerloo."

Damian Camacho added: "Bakerloo looking like a 70's disco train.

"We definitely needed it more lol."

Others thought the Central line is overdue an upgrade, saying "It’s been left for years".

However, lots of commuters welcomed the news.

Jake Bennett said: "It is going to be weird having these new trains on the Piccadilly Line, but a welcome change, including having air conditioning."

Margherita Murphy commented "Fantastic.

"About time it was upgraded."

Many commuters were concerned over continuing accessibility issues across the London Underground.

Avril Smith said: "Money should be spent making all stations step free.

"Old Street station for one is a nightmare of steps and there are others unusable by people with reduced mobility."

Lewis Allonby added: "I bet accessibility won't change as usual.

"Even if there is a lift, we're lucky if it's working, after going through a maze to find it."

TfL assured that they are improving accessibility across the Piccadilly line by improving platform-to-train step-free access and reviewing station platforms, with the aim to complete the works before the new train fleet is in service.

However, they declined to comment further on the issue.

Among the improvements, commuters can expect walk-through carriages, air-conditioning, wider double doorways, enhanced digital displays and increased CCTV security on the new Piccadilly line trains.

The new trains will replace the old fleet starting from 2025.