A patch-up job was possible but it might have lasted only another five years, and both repair or replacement would cost a a lot of money.
Mr Bradshaw said the sensible thing to do was to get a new boiler made which could last another 90 years. The full cost, however, could be as high as $200,000.
The cheapest option was to get it made in China but the trust wanted to keep the work in New Zealand.
Three Kiwi firms could do the job with a Dannevirke company, which had just made new boilers for Glenbrook's vintage railway, looking the most promising.
Mr Bradshaw said he was keen to have Gabriel steamed up again by Christmas but it was more likely to take until next Easter. In the meantime a stripped-back, sorry-looking Gabriel was parked in the railway workshop.
"It's depressing to see her like that. Gabriel has been part of my life since 1985. But we shall overcome, the boiler will be made and all will be well," Mr Bradshaw said.
Train rides are continuing with diesel engines instead of steam. A newly restored diesel locomotive arrived in Kawakawa on Wednesday, bringing the number of working engines to three. Three more are due to arrive next week.
Gabriel was built by Peckett and Sons in Bristol, England. It was previously used by the Portland Cement Company near Whangarei.
* A Givealittle campaign has been started to help pay for a new boiler. Go to givealittle.co.nz/org/boivrgabrielboiler to donate. The trust is also applying for grants.