Philip Kingston was applauded by climate change activists and supporters outside Highbury Corner Magistrates' Court on Friday after being released on conditional bail.
White-haired Mr Kingston said outside court: "It's a bit of a shock actually to be released, I'm delighted.
"I was assuming like the three arrested last week we would be remanded in prison - they have had the worst of it up to now.
"My only reservation is we're not in solidarity with them."
The octogenarian and five other climate activists are accused of gluing themselves to a DLR train in the Canary Wharf financial district in London on Thursday.
Prosecutor Alex Britton told the court "numerous trains were affected and delayed" and estimated the cost of the disruption to the rail network at about £80,000.
Look who have just been released..
— Christian Climate Action (@CClimateAction) April 26, 2019
All six of the group involved in the action on the Canary Wharf DLR.
Thank you everyone for your support.#ExtinctionRebellion pic.twitter.com/MCzNg5tzlA
Three other people accused of the same charge were last week denied bail and kept in custody - however one, Cathy Eastburn, was released on bail after a hearing at Blackfriars Crown Court on Thursday, the Crown Prosecution Service confirmed.
All six defendants, who are part of the Christian Climate Action group, indicated not guilty pleas on Friday and were all released on conditional bail by district judge Susan Williams.
In front of a packed public gallery, the judge told Mr Kingston: "Quite frankly, how you got up to the roof of that train, Mr Kingston, I don't know, but your knees are obviously better than mine."
This morning we sang hymns of praise to the creator on the roof of the Canary Wharf DLR
— Christian Climate Action (@CClimateAction) April 25, 2019
God thank you for this beautiful world that you have made & for every unique person on it. We stand here with sorrow & desperation in our hearts@SadiqKhan business as usual is not an option pic.twitter.com/7eOwKt8oIm
The other defendants are Ruth Jarman, 55; shoemaking teacher Nick Cooper, 37; Ian Bray, 51; Richard Barnard, 46; and Diana Warner, 60.
The judge said: "The widespread public disruption that took place yesterday at the height of rush hour was quite clearly planned.
"I take the view this matter is too serious to be tried in this court so I'm allocating your case to the Crown Court."
She set a hearing date at Blackfriars Crown Court on 23rd May.
Thank you to everyone who has been in contact with us with words of support. We really appreciate every word.
— Christian Climate Action (@CClimateAction) April 25, 2019
Apologies that we have not been able to respond yet to most of you.
It's been an exciting but tiring two weeks so thank you for being patient with us pic.twitter.com/lLGCjuhCUd
Bail conditions include an 11pm to 7am curfew and not entering the area bounded by the M25 with exceptions including meeting lawyers or attending church services.
The other activists accused of the same charge of obstructing trains or carriages on the railway by an unlawful act were from the Extinction Rebellion group, also known as XR.
Kingston, of Patchway, South Gloucestershire, Jarman, of Hook, Hampshire, Cooper, of Northampton, Northamptonshire, Bray, of Meltham, West Yorkshire, Barnard, of Hornsey, north London, and Warner, of Bristol, were greeted by supporters outside court.
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