Maverick and Zulu are deployed at East Yorkshire's Filey, Beverley and Drifield stations as part of the 12-week trial that began in February.
The Harris Hawks are there to stop pigeons and prevent them from building nests, but they are not used for hunting.
If they prove to be effective, they can be featured at other northern stations that have been plagued by pigeons in recent years.
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Train operators are trapped in a long-term battle with birds as they damage the station's roof and cause problems with dangerous, corrosive droppings.
“We've seen you get a lot of money,” said Alex Hornby, Northern Commercial and Customer Director. “We tried plastic owls and recorded hawk noise, but it wasn't an effective deterrent.
“The pigeons are a real nuisance for our customers and cause headaches for train station staff who have to chase them. That's why we are determined to find a humane way to keep them apart.”
Northern has tried a variety of measures, with plastic owls installed at Northumberland's Morpeth station last year.
Recorded hawk sounds were played from speakers at Driffield Station, and the roof was painted with “fire gel.” This appears on the pigeon as ultraviolet light, making you think it's too high on the surface and is too hot to land.
However, the North was forced to take a different approach as pests flocked to both stations and nesting.
Spikes and netting have proven to be much more effective because it prevents birds from sitting or nesting in certain areas without causing any harm.
However, these measures do not resolve the issue as pigeons move to other parts of the station.
Last year, Northern asked customers to stop feeding birds and leaving food behind.
The Hawks, currently used at northern stations, are provided by pest control company Rentkill.
Northern is the UK's second largest train operator, with over 500 stations in northern England with 2,500 services per day.
